12 PCS LED Lighted Nocks Automatic Nocks Lighted Archery New Lighted Nocks for 6.2mm Archery HuntiBreakthrough Design--Lighted nocks for arrows with switch, turn on automatically when Amazing LED Nock--Very bright, fit for arrows with 6.2mm/.244 inch inside diameter High Visibility--Clear plastic for maximum light transmission,find the quarry and even at night or dawn Long Battery Life--48+ hours of battery life,long lasting but light weight Super Handy--Simple On/Off switch design (without tool),no assemble required Colour: Green+Transparent+Silver Material: PC Size: 6.2mm Package Contents: 12 x nocks Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.