[DURABLE MATERIAL]: The Wrench: aluminum alloy tungsten steel. And the weights include protective rubber rings seal to avoid wet entering putter weight hole [PORTABLE GOLF TOOL]: Small and lightweight, very convenient to carry. Regarding the tool, please be sure its completely flush with the weights when installing/uninstalling the weights, or you could run the risk of bending the pins [WIDE COMPATIBILITY]: The weights and wrench fit for all non-mallet Titleist & Studio Select models, including Newport, Button Back, My Girl, Select GoLo, Select Mid & Long, California and Kombi. They do not fit Squareback, Fastback, or Detour model [PACKAGE INCLUDED]: Pack of 1 x Wrench, 2 x Weights. You may have to use moderate force, please ensure that the weight tool posts stay securely in the weight post holes Specifications: Material:for Wrench Aluminum Alloy, for 5-20g weights Stainless steel. Color:Blue.(Grams marked in the center area.) We have 5g,10g,15g,20g,25g weights for you choose. Dimension: Approx.3.15"*2.64"*0.98"(8.0cm*6.7cm*2.5cm)(L*W*Dia.) for Wrench. Approx.0.87"*0.31"(2.2cm*0.8cm)(Dia.*H)for weights. Package List: 1 PC Wrench + 1 Pair Weights