Lightweight, dependable and highly visible, with a shot-activated switch that won’t turn off until reset by the archer. Made of clear plastic, the nock provides maximum light transmission and can be seen for hundreds of yards. The breakthrough design weighs 25% to 50% less than other lighted nocks. Installation requires no glue or magnets. Battery lasts up to 20 hours. FitsGold Tip arrows with .246" ID shafts. Weight: 20 gr. Colors: Red, Green, Blue, Pink.