This is a Package of Four Sets of G Scale Train Wheels from The Big Hauler Series by Bachmann. FEATURES: 31mm diameter large wheels. Silver metal wheels with black axles. Works with any G scale equipment. Carded packaging. INCLUDES: Four Sets of G Scale Train Wheels. REQUIRES: G Scale Train Equipment Adult Supervision SPECS: Scale: G 1:22.5 Width: 2-5/8" (67mm) COMMENTS: Keep small parts away from children under 3 years of age. sdw 1/31/01 ir/jl