Metolius M-16 Bouldering Brush Black. Originally designed to clean the internals of an M-16 rifle it's also great for cleaning the intricate parts of your cams. Features two different head sizes with super-stiff bristles. Specifications for Metolius M-16 Bouldering Brush: Manufacturer: Metolius Color: Black Quantity: 1 Included Accessories: Standard Climbing Accessory Type: Brush Kits Chalk Bag Package Contents: Metolius M-16 Bouldering Brush Metolius M16B001: M-16 Bouldering Brush Black Metolius M16B001: M-16 Bouldering Brush Black