Alumninum, Silicone; COB work light with aluminum body matching color silicone loop; Use silicone loop to attach item to bags and belt loops; Uses 5 button cell batteries (LR44), included, replaceable; COB light with 42 lumens; Note: Item ships with battery blocker; must be removed prior to use; Product Size: 7.5 l x 0.3125 dia.