1Pair Tail Wheel Black Rubber PU RC Airplane Replacement Plastic Hub Plane Toy Parts Wholesale Quality Rubber Pu Wheels Material:Quality Rubber PU ; Hub Core:Plastic NylonColor:BlackQuantity:1pairSize:1 inch = 2.54 cm1.00" - diameter about: 26MM, thickne 9MM, inner hole: 2.1MM, weighs 1.5 grams1.25" - diameter about: 32MM, thickne 10MM, inner hole: 2.1MM, weighs 2.0 grams1.50" - diameter about: 38MM, thickne 15MM, inner hole: 2.1MM, weighs 4.0 grams1.75" - diameter about: 45MM, thickne 15MM, inner hole: 2.1MM, weighs 5.0 grams2.00" -- diameter: about 50MM, thickne 19MM, inner hole: 2.6MM, weight 7.0g2.25" - diameter: 55MM, thickne 21MM, inner hole: 2.6MM, weight 8.5g2.50" - diameter about: 64MM, thickne 24MM, inner hole: 3.1MM, weighs 11.0 grams2.75" - diameter about: 70MM, thickne 26MM, inner hole: 3.1MM, weighs 15.0 grams3.00" - diameter about: 76MM, thickne 27MM, inner hole: 3.6MM,weighs 21.0 gramsPackage Include: 1pairNotice:1.1cm=10mm=0.39inch.2.Please allow 1-2mm error due to manual measurement and make sure you do not mind before ordering.3.Please understand that colors may exist chromatic aberration as the different placement of pictures.