Du-Bro Low Bounce Smooth Wheels are Perfect for Trainer, Sport, Scale or Pattern Aircraft Models. FEATURES: Low-Bounce, Non-Treaded Smooth Tires Nylon Hub for Longer Wear INCLUDES: Two 2-1/4" Low Bounce Wheels SPECS: Width: 3/4" (20mm) Weight per Wheel: 1.5 ounce (41 grams) Hole Diameter: 1/8" (4mm) Outside Diameter: 2 1/4" (57mm) COMMENTS: Hubs fit 5/32" axles. May be drilled out to fit 3/16" axles maximum. NMH 3-5-92 upaxy5/23/98 updated JPG 3/29/02 ir/jl