This is a pair of 2.5" Ultra Light Wheels from GWS. These are used as landing gear wheels when weight saving is important. FEATURES: Thin rubber tires White plastic wheel INCLUDES: Two wheels with tires REQUIRES: Attaching to aircraft SPECS: Thickness: .15" (4mm) Diameter: 2.5" (63.5mm) Mounting Hole: 0.06" (1.5mm) mcw 12/7/04 ir/jxs