The Weapon R Hybrid coolant & windshield washer fluid tank is made of billet 6061 aluminum and TIG welded with billet aluminum CNC machined fittings. The filler cap on the Weapon R hybrid tank for the WRX & STI is CNC machined to fit perfectly and then hard anodized for color coordination & durability to last for years to come. Each kit also comes with a polished aluminum bracket and stainless steel clamps, to mount your new reserve tank. Also included is 3 foot of high silicon clear fiber reinforced tubing to route your coolant or oil vapors.