The S3 sintered compound is optimal for street bikes, dual sport, touring, cruisers. It's recommended on applications with rather larger engines or for people who ride harder than average and want the great stopping power of a sintered brake pad. Fits: Kawasaki GPX250R 1986-2007 GPX400 1987-1988 GPX400R 1986 GPZ 500/EX500R 2002-2009 KR1S 1989-1990 KR250 (KR-1) 1988 KR250 (KR-1S) 1991-1993 ZR550 ZEPHYR 1991-1993 ZR750 ZEPHYR 1991-1995 ZX4 (400cc) 1988 ZXR250 A 1989 ZXR250 B 1990 ZXR250 C 1991-1998 Suzuki RGV250 1991-1999