Brake pads (2) for Brister's Design & Mfg. karts. Also fits others, including some Yerf-dog.  Fits Airheart and Thomas brake calipers.  (3/8" thick, 1 9/16" wide, 1 1/4" high).  This is an aftermarket part that replaces Comet 218198A and 218198C, two of Ken-bar 3000-1006, and Brister's Thunder Karts 20410Z0020.  This puck is slightly different from the 218198A/C and 211674A/C, but it will work.