Exotek Flite 48P Machined Spur Gears are a great solution when you want a precise, perfectly round and super lightweight spur gear. These gears are truer and much stiffer than a standard nylon spur gear and weigh a mere 4.1 grams. Must use with Exotek Direct Spur Hub. (AE - EXO1379, TLR - EXO1419, Kyosho - EXO1423, Yokomo - EXO1558), XRAY - EXO1582).