This is a set of 4 wheels. The wheels are CNC cut from 1/2" thick Rubber and sandwiched between 1/2" UHMW that are chamfered. Each wheel has a bearing to fit on a 1/2" diameter shaft. The drive wheel has a #25 32 tooth chain sprocket mounted to it. The idler wheel is the same as the drive wheel, less the sprocket and timing teeth on the 1/2" thick rubber. The wheels come assembled. Each wheel weighs ~1.25lbs.

To purchase both the track and wheels see LT2 Pair of Molded Spliceless Tracks and Wheel Set - Generation 4 (TD-142-002)