We pick the color; if you have a preference please specify in comments. May be white or black delrin.The Shocktech Superfly Bolt combines a three-hole design with a cupped tip to cradle the ball; it is manufactured with a ramped inlet and integral quick-pull pin. The bolt has an aluminum shaft for strength, and delrin to reduce friction anywhere the bolt might come in contact with the internals. Delrin may come in white or black. If you have a preference, please indicate it in the comments box during the order process and we will try to oblige.