Part #: 8261. The bobbin is molded from Dupont Rynite FR946 material which has incredible dielectric capabilities at high temperatures. Product Line: MSD. Holley, Holley EFI, Aeroflow, Aeromotive, B&M, MSD, Brawler, Hooker, Hurst, Mr Gasket, MSD Dynaforce, NOS, Quick Fuel Technology, Racepak, Spal Fans, Weiand, Jesel, Wilson Manifolds, Competition Cams, Crower Lifters, Johnson Lifters, Daimond Pistons, CP Pistons, CP Carrillo, RCD, GRP, Dailey Engineering, Manton Pushrods.