The Thunderglo Illuminated Blue Nocks 6 Pack offers enhanced visibility and durability for archers with its polycarbonate nocks and aluminum shafts. Equipped with bright LED illumination activated automatically upon release the nocks remain lit until manually unclicked ensuring reliable tracking after every shot. The universal collar design accommodates various arrow shafts including G X H and S sizes making it versatile for different setups. These premium nocks deliver superior performance and are a valuable addition to any archer's gear.