ZETA and DRC products are distributed over 50 countries now. They ride dirt bikes. They develop products for dirt bikes. They test, manufacture and supply high quality products for dirt bike riders. Made of forged 6061 aluminum, lightweight. Suitable for mounting plastics and more. Available in four different designs and five different anodized colors. 18 x 6 spacers are sold in sets of 4 and 20. 20 x 6 type 31 spacers are sold in sets of 10.