Usage Tips:[Lighted Nocks for 7.62mm Arrows]: Led Nocks for 7.62mm Shaft Fits All Shafts with a .0.297inch Inside Diameter.[On/Off Switch]: The Nocks will Automatically Light on when You .Push Up if You Want to Turn off.Waterproof and Shock Resistant Design.[Long Battery Life]: High Visibility and Long Lasting Batteries Life.Tithium Batteries is Perfect for Hunting at darkness with 36+ Hours of Battery Life.[High Visibility]: Clear Plastic for Maximum Light Transmission.Reliable Resistant & Durable Quality - Piston Driven Contact Switch Ensures L.E.D. Illumination Every Time.Colour: green+silver+transparentMaterial: PCSize: 7.62mmPackage Contents:6 x nocksOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.