Propylene random copolymer (R-PP) with ethylene, wherein (a) said propylene copolymer (R-PP) has an ethylene content in the range of 5.3 to 9.0 wt.-%, a melting temperature Tm as determined by DSC according to ISO 11357 in the range of 128 to 138°C, and a xylene cold soluble fraction in the range of 9.0 to 18.0 wt.-%; (b) said propylene copolymer (R-PP) has a melt flow rate MFR2 (230 °C) measured according to ISO 1133 in the range of 0.8 to 25.0 g/10min; (c) said propylene copolymer (R-PP) comprises two fractions, a first propylene copolymer fraction (R-PP1) and a second propylene copolymer fraction (R-PP2) and said first propylene copolymer fraction (R-PP1) differs from said second propylene copolymer fraction (R-PP2) in the ethylene content; (d) the first propylene copolymer fraction (R-PP1) has an ethylene content in the range of 4.5 to 7.0 wt.-% based on the first propylene copolymer fraction (R-PP1); and (e) a relative content of isolated to block ethylene sequences (I) in the range of 45.0 to 69.0 %, wherein the I content is defined by equation I E = fPEP fEEE + fPEE + fPEP × 100 wherein I is the relative content of isolated to block ethylene sequences [in %]; fPEP is the mol fraction of propylene/ethylene/propylene sequences in the sample; fPEE is the mol fraction of propylene/ethylene/ethylene sequences and of ethylene/ethylene/propylene sequences in the sample; fEEE is the mol fraction of ethylene/ethylene/ethylene sequences in the sample wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data. (a) said propylene copolymer (R-PP) has an ethylene content in the range of 5.3 to 9.0 wt.-%, a melting temperature Tm as determined by DSC according to ISO 11357 in the range of 128 to 138°C, and a xylene cold soluble fraction in the range of 9.0 to 18.0 wt.-%; (b) said propylene copolymer (R-PP) has a melt flow rate MFR2 (230 °C) measured according to ISO 1133 in the range of 0.8 to 25.0 g/10min; (c) said propylene copolymer (R-PP) comprises two fractions, a first propylene copolymer fraction (R-PP1) and a second propylene copolymer fraction (R-PP2) and said first propylene copolymer fraction (R-PP1) differs from said second propylene copolymer fraction (R-PP2) in the ethylene content; (d) the first propylene copolymer fraction (R-PP1) has an ethylene content in the range of 4.5 to 7.0 wt.-% based on the first propylene copolymer fraction (R-PP1); and (e) a relative content of isolated to block ethylene sequences (I) in the range of 45.0 to 69.0 %, wherein the I content is defined by equation I E = fPEP fEEE + fPEE + fPEP × 100 wherein I is the relative content of isolated to block ethylene sequences [in %]; fPEP is the mol fraction of propylene/ethylene/propylene sequences in the sample; fPEE is the mol fraction of propylene/ethylene/ethylene sequences and of ethylene/ethylene/propylene sequences in the sample; fEEE is the mol fraction of ethylene/ethylene/ethylene sequences in the sample wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data. I is the relative content of isolated to block ethylene sequences [in %]; fPEP is the mol fraction of propylene/ethylene/propylene sequences in the sample; fPEE is the mol fraction of propylene/ethylene/ethylene sequences and of ethylene/ethylene/propylene sequences in the sample; fEEE is the mol fraction of ethylene/ethylene/ethylene sequences in the sample wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data.