Dave Brown Lite Flite Wheels are Perfect for Trainer, Sport, Scale or Pattern Aircraft Models. FEATURES: Low-Bounce, Non-Treaded Foam Tire Snap-Together Nylon Hub for Longer Wear These are made Specifically for Electric Aricraft INCLUDES: Two 2-1/4" Lite Flite Wheel SPECS: Width: 1/2" Weight per Wheel: 0.32 ounce Center Hole Diameter: 1/8" Outside Diameter: 2-1/4" COMMENTS: Hubs fit 1/8" axles, but may be drilled out to fit 3/16" axles maximum. NMH 3-5-92 upaxy5/23/98 ir/jl updt jxs 5/12/05