New Archery Products Thunderglo Illuminated Nock Red 6 Pack NAP-ILLN-RD. 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). Specifications for New Archery Products Thunderglo Illuminated Nocks - 6 Pack: Manufacturer: New Archery Products Quantity: 6 Pack Fabric/Material: Polycarbonate/Aluminum Features of New Archery Products Thunderglo Illuminated Nock Red 6 Pack Ultra lightweight low profile countoured cups soft pvc ear pads ANSI standard S3.19 rated Package Contents: New Archery Products Thunderglo Illuminated Nock Red 6 Pack New Archery Products NAP-ILLN-RD: Thunderglo Illuminated Nock Red 6 Pack