High-performance, cast pistons closely match original equipment Engineered for the best possible heat transfer from combustion chamber to cylinder walls Rings are replacement for one piston All pistons are priced with ring(s), wrist pins and circlips - Polaris Indy 600 SE (1985); Polaris Indy 400 (1985, 1990, 1991, 1987, 1988, 1989, 1986); Polaris Indy 600 w/121" Track (1985, 1987, 1986, 1984); Polaris Indy 600 LE (1986); Polaris Indy Classic 400 (1989, 1988, 1990, 1991)