Shooting Made Easy Sight Rite Chamber Cartridge Laser Bore Sighting System 12 Gauge Projectiles webbing: polyester webbing: polyester Narrow straps of retention system are very soft and light so as not to press like standard hard plastic headbands Soft rear adjustment system conforms better to the head and ensures compact backpack storage Extended chin strap length allows a hat to be worn underneath 4 headlamp clips are robust for easy handling and secure attachment of any headlamp and are imbedded to combat snagging 11 vents and air channels built in the foam facilitate excellent ventilation Inside padding is fully removable and washable Units include (3) three LR41 lithium batteries Get meticulous accuracy with the most exacting tolerance specifications in the sighting industry