Hydrosilylation-crosslinkable compositions containing organopolysiloxanes consisting of units of formulae R 2 R 1 SiO 1/2, R 2 SiO 3/2 and optionally units selected from the group consisting of units of formulae R 2 (OR 3)SiO 2/2 and R 2 (OR 3) 2 SiO 1/2 (VIII), wherein R may be identical or different and represents hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds, R 1 represents monovalent hydrocarbon radicals having aliphatic carbon-carbon multiple bonds, R 2 represents aromatic hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds and R 3 may be identical or different and represents hydrogen or alkyl and with the proviso that in the organopolysiloxanes the sum of the units of formula, based on the sum of all units of formulae,, and (VIII), is 0.15 to 0.24, in the organopolysiloxanes the sum of the units of formulae and (VIII), based on the sum of all units of formulae,, and (VIII), is not more than 0.08, organopolysiloxanes contain an average of 10 to 20 silicon atoms, organopolysiloxanes have a polydispersity Mw/Mn of 1.05 to 1.40 and a weight-average Mw of 1350 to 1850 g/mol upon measurement according to the description, and organopolysiloxanes have an average number of radicals R 1 per molecule, reported in mol(R 1)/mol, of 1.1 to 3.8, organosilicon compounds having two Si-bonded hydrogen atoms containing units of formula R 4 e H f R 5 g SiO (4-e-f-g)/2, wherein R 4 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, saturated hydrocarbon radical, R 5 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, aliphatically saturated aromatic hydrocarbon radical, e is 0, 1, 2 or 3, f is 0, 1 or 2 and g is 0, 1 or 2, with the proviso that e+f+g = 4 and two Si-bonded hydrogen atoms are present per molecule, and catalysts which promote addition of Si-bonded hydrogen onto an aliphatic multiple bond. organopolysiloxanes consisting of units of formulae R 2 R 1 SiO 1/2, R 2 SiO 3/2 and optionally units selected from the group consisting of units of formulae R 2 (OR 3)SiO 2/2 and R 2 (OR 3) 2 SiO 1/2 (VIII), wherein R may be identical or different and represents hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds, R 1 represents monovalent hydrocarbon radicals having aliphatic carbon-carbon multiple bonds, R 2 represents aromatic hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds and R 3 may be identical or different and represents hydrogen or alkyl and with the proviso that in the organopolysiloxanes the sum of the units of formula, based on the sum of all units of formulae,, and (VIII), is 0.15 to 0.24, in the organopolysiloxanes the sum of the units of formulae and (VIII), based on the sum of all units of formulae,, and (VIII), is not more than 0.08, organopolysiloxanes contain an average of 10 to 20 silicon atoms, organopolysiloxanes have a polydispersity Mw/Mn of 1.05 to 1.40 and a weight-average Mw of 1350 to 1850 g/mol upon measurement according to the description, and organopolysiloxanes have an average number of radicals R 1 per molecule, reported in mol(R 1)/mol, of 1.1 to 3.8, R may be identical or different and represents hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds, R 1 represents monovalent hydrocarbon radicals having aliphatic carbon-carbon multiple bonds, R 2 represents aromatic hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds and R 3 may be identical or different and represents hydrogen or alkyl and with the proviso that in the organopolysiloxanes the sum of the units of formula, based on the sum of all units of formulae,, and (VIII), is 0.15 to 0.24, in the organopolysiloxanes the sum of the units of formulae and (VIII), based on the sum of all units of formulae,, and (VIII), is not more than 0.08, organopolysiloxanes contain an average of 10 to 20 silicon atoms, organopolysiloxanes have a polydispersity Mw/Mn of 1.05 to 1.40 and a weight-average Mw of 1350 to 1850 g/mol upon measurement according to the description, and organopolysiloxanes have an average number of radicals R 1 per molecule, reported in mol(R 1)/mol, of 1.1 to 3.8, organosilicon compounds having two Si-bonded hydrogen atoms containing units of formula R 4 e H f R 5 g SiO (4-e-f-g)/2, wherein R 4 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, saturated hydrocarbon radical, R 5 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, aliphatically saturated aromatic hydrocarbon radical, e is 0, 1, 2 or 3, f is 0, 1 or 2 and g is 0, 1 or 2, with the proviso that e+f+g = 4 and two Si-bonded hydrogen atoms are present per molecule, and R 4 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, saturated hydrocarbon radical, R 5 may be identical or different and represents a monovalent or divalent, SiC-bonded, optionally substituted, aliphatically saturated aromatic hydrocarbon radical, e is 0, 1, 2 or 3, f is 0, 1 or 2 and g is 0, 1 or 2, with the proviso that e+f+g = 4 and two Si-bonded hydrogen atoms are present per molecule, catalysts which promote addition of Si-bonded hydrogen onto an aliphatic multiple bond.