Made of high quality tungsten steel, heavy duty and anti-rust, duable for long time use *DO NOT fit 2018 Select Squareback putters Package included: 2 x 15g Weights Red dot design with number in center Please choose the weights you need. Please confirm if these weights work with your putter before your purchase. Weights include protective rubber rings seal (O rings) to avoid moisture from entering your putter weight cavity. Install or remove weights with special 5-pins wrench tool, and please care to ensure that the wrench tool posts stay securely in the weight post holes.