1.satisfied for Opel ; 2.got TS16949 certification; 3.has a long life cycle( 30000kms) Product features: 1) No squealing and excellent stopping power due to our specially formulated friction compound mixture. 2) Competitive pricing and quality assurance 3) Availability for the most popular range of applications 4) No black dust residue 5) Life long ( 30000kms) 6) Friction coefficient 0.35-0.4 7) TS16949 GB5763-1998certification