The Vision Internal Weight Studs for the Pro Buttstock increases your rifles weight by 100g / 3.5oz. This weight kit offers a unique advantage with its discreet mounting in six individual pieces at the very rear of the chassis. This allows for precise, ultra-fine adjustments to the weight and balance of your rifle. For our entire product line we include Black Stainless steel screws so that you won’t have to worry about any of our screws rusting after a wet day. Only compatible with Vision Pro Buttstocks. ( Vision Pro buttstocks replaced our original buttstock in March 2024 ) Specifications: Total Weight: 100g / 3.5oz Material: Steel Surface treatment: Black-Oxidized Screws: Black-Oxidized Stainless steel – M4x5 – T20