See your shot and impact point
X nocks fit shafts with a .204-inch inside diameter.
S nocks ‑ also called Super Nocks ‑ fit shafts with a .244-inch inside diameter.
About 30 hours of battery life(non-replaceable)
Bowstring Activated On-off Switch
Waterproof and shock resistant
No assembly required
Lightweight and precision-balanced for superior accuracy.
Fits inner diamter 5.3mm/6.2mm most standard arrows.
Color: green, red, blue and yellow for your choice
Material:Clear plastic + LED stick
How to use:
Nocks can be inserted to the shaft easily and in fully operational condition.
Automatically lighted after shoot, you do not need use hand to light it first (can be turned on or off by the mini screwdriver)