This is a Combo Weight Set for Pinewood Derby Cars from Pine Car. The heavier your car, the faster it goes. Incremental weights allow you to adjust your car's weight. Remove portion of weight needed with a hacksaw. Attach to sides of car using glue or drill a 3/8" diameter hole in car and glue weights in hole. Carded packaging with instructions on the rear. One Combo Weight Set. Hacksaw Glue Length: 3" (76mm) Width: 1-1/2" (38mm) Weight: 2oz (56g) Pine Car has a full line of Pinewood Derby cars and accessories. sdw 8/31/01 ir/kh &