Barnett strobe lighted nocks are designed to be the perfect fit for Headhunter 20" and 22" inch arrows. These nocks enhance shot visibility in low-light scenarios. Strobing light assists in finding arrow and provides visibility to where shot placement occurred. The multicolored strobing lights alternate between multiple color patterns, 'pulse', 'fade', and 'flash' which enhance visibility of the arrow once it has been shot. Strobe lighted nocks are easily controlled with an on/off switch. The lighted nocks are designed to fit .300” inner diameter crossbow arrows utilizing half moon nocks.