This is the Du-Bro RC 3/4" Diameter Tailwheel for .40 size airplanes. Du-Bro Tailwheels are sporty looking and have a machined one piece aluminum hub. Fits 1/16 Axle (2mm).DuBro 3/4" TailwheelSKU: 75TW$3.95PriceQuantity*Add to Cart