This is a pair of DAVE BROWN treaded LITE FLITE wheels good for use on electric powered airplanes or any other plane where weight is a factor. FEATURES: Injection molded snap-together hubs which are light gray in color Light-weight, low-bounce durable foam ribbed tread tires Hubs are a spoke-like design INCLUDES: Two wheels SPECS: overall diameter - 2 1/4" hub diameter - 1 3/32" width - 3/4" axle hole diameter - 5/32" (can be drilled up to 3/16") btm 06/11/94 Weight per wheel- 0.43 ounce updateaxy5/23/98