These are Gray Super Star Wheels for the HPI Super Nitro RS4 Kits. FEATURES: Gray plastic construction Five spoke design YOU WILL RECEIVE: Two Gray Super Star Wheels REQUIREMENTS: Super size tires, use HPI # 4590, 4591 or 4592. Super inner foams, use HPI # 4691, 4692, 4695 or 4697. SPECIFICATIONS: Diameter: 57mm (2.2") Width: 35mm (1-3/8")_ COMMENTS: These are specific to the Super Nitro because of their unique size. snew 07/02/00 ir/jl &