#html-body [data-pb-style=F74T1SL]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}NAP Thunderglo Lighted Nocks have ultra bright LED illumination and feature an easy on/off feature. Thunderglo Lighted Nocks are crafted of a polycarbonate blend with an aluminum shaft making them extremely durable for long lasting use and life expectancy. Its universal collars will allow Thunderglo Nocks to fit most any arrow (G/X/H/S). Polycarbonate blend Nock with aluminum shaft Bright LED Illumination Auto ON when nock is shot LED Stays ON until user unclicks the nock Universal collars fits Arrow Shafts (G/X/H/S)