Nockturnal G Nock Shift Lighted Nocks Strobing Set of 3 Red/Green. Built from clear polycarbonate each nock includes a streamlined tool-free on/off switch and runs on long-life lithium power. This G Nock Shift model fits G arrows and includes Universal FIT collars in a 3-pack. Battery life is 17+ hours with non-shift G Series options offered in multiple colors. Specifications for Nockturnal G Nock Shift Lighted Nocks: Manufacturer: Nockturnal Quantity: 3 Illumination Type: LED Features of Nockturnal G Nock Shift Lighted Nocks: Super-bright LED illumination Lithium battery power Clear polycarbonate construction Streamlined tool-free on/off switch Fits G arrows Includes universal FIT collars Battery life: 17+ hours Available in Red Green Blue Pink Orange and two color strobing 3 pack Package Contents: Nockturnal G Nock Shift Lighted Nocks Nockturnal NT-819: G Nock Shift Lighted Nocks Strobing Set of 3 Red/Green