This is the 1/25 Scale Big Rig Wheels and Tire Set by Moebius. Wheel and tire set for replacement use on most modern semi kits Set includes 2 front wheels and 4 rear wheels sets (4 inner and 4 outer) Identical to the current set used in the Moebius LoneStar and ProStar kits Instruction on back of box One plastic model Assembly Hobby knife (RMXR6909) Sprue cutters (HCAR0630) Scale 1/25 Due to small parts that could cause a choking hazard please keep away from children 3 years of age and younger