No comment, immediate purchase welcome! For necks with excessively high string action. Guitar/Bass Shim Set - 4 Pieces 【Thickness Sizes】 0.25mm x 2 0.5mm x 1 1.0mm x 1 *Please understand that the thickness may not be 100% accurate as it is measured with an analog caliper. A shim is a spacer inserted at the end of the neck pocket. By creating space here, you can adjust the angle of the neck joint. When the strings are closer to the body, slap techniques become easier, especially for bass. We offer a set of 4 different thicknesses so you can adjust to your preference. There are various types of shims, but brass and iron are the best. Because it's an important instrument, you should pay attention to the material. This is a solid brass material. 【How to Use】 1. Remove the neck 2. Place your preferred shim 3. Reattach the neck. You can find detailed setup instructions by searching online. ★-★-★-★-★-★-★ We do not offer discounts. No need to ask "Can I buy this?"! Please purchase directly! ★-★-★-★-★-★-★