A propylene copolymer composition selected from - a polypropylene composition (a) comprising, - a multimodal polypropylene (a) comprising, a random copolymer of propylene having - an MFR 2 of 0.01 to 0.5g/10min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer(s) selected from ethylene or C4-C10 alpha olefins and having a comonomer content of 5.8 to 7.3 mol%; a random copolymer of propylene having - an MFR 2 of 0.1 to 15 g/10 min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer selected from ethylene or C4-C10 alpha olefins; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; optional β-nucleating agent; and optional further additives other than the optional β-nucleating agent; wherein the propylene copolymer composition has an MFR 2 of 0.15 to 0.30 g/10 min and a comonomer content of 4.4 to 6.0 mol%; or - a polypropylene composition (b) comprising - a multimodal polypropylene (b) comprising a random copolymer of propylene having a comonomer content of 5.8 to 7.3 mol%, a random copolymer of propylene; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; β-nucleating agent; and optional further additives other than the β-nucleating agent; wherein the propylene copolymer composition has an MFR2 of 0.15 to 0.30 g/10 min and a comonomer content of 4.4 to 6.0 mol%; and wherein the propylene copolymer composition is at least partially crystallized in the β-modification by said β-nucleating agent and has B > 0.6, wherein the B is defined as described in the specification under Determination methods. - a polypropylene composition (a) comprising, - a multimodal polypropylene (a) comprising, a random copolymer of propylene having - an MFR 2 of 0.01 to 0.5g/10min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer(s) selected from ethylene or C4-C10 alpha olefins and having a comonomer content of 5.8 to 7.3 mol%; a random copolymer of propylene having - an MFR 2 of 0.1 to 15 g/10 min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer selected from ethylene or C4-C10 alpha olefins; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; optional β-nucleating agent; and optional further additives other than the optional β-nucleating agent; wherein the propylene copolymer composition has an MFR 2 of 0.15 to 0.30 g/10 min and a comonomer content of 4.4 to 6.0 mol%; or - a multimodal polypropylene (a) comprising, a random copolymer of propylene having a random copolymer of propylene having - an MFR 2 of 0.01 to 0.5g/10min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer(s) selected from ethylene or C4-C10 alpha olefins and having a comonomer content of 5.8 to 7.3 mol%; a random copolymer of propylene having - an MFR 2 of 0.1 to 15 g/10 min (ISO 1133, 2.16 kg load, 230°C), - one or more comonomer selected from ethylene or C4-C10 alpha olefins; optional β-nucleating agent; and optional further additives other than the optional β-nucleating agent; - a polypropylene composition (b) comprising - a multimodal polypropylene (b) comprising a random copolymer of propylene having a comonomer content of 5.8 to 7.3 mol%, a random copolymer of propylene; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; β-nucleating agent; and optional further additives other than the β-nucleating agent; wherein the propylene copolymer composition has an MFR2 of 0.15 to 0.30 g/10 min and a comonomer content of 4.4 to 6.0 mol%; and wherein the propylene copolymer composition is at least partially crystallized in the β-modification by said β-nucleating agent and has B > 0.6, wherein the B is defined as described in the specification under Determination methods. - a multimodal polypropylene (b) comprising a random copolymer of propylene having a comonomer content of 5.8 to 7.3 mol%, a random copolymer of propylene; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; β-nucleating agent; and optional further additives other than the β-nucleating agent; a random copolymer of propylene having a comonomer content of 5.8 to 7.3 mol%, a random copolymer of propylene; wherein the random copolymer of propylene has a lower MFR 2 and higher comonomer content than the random copolymer of propylene; β-nucleating agent; and optional further additives other than the β-nucleating agent;