Material: Copper with Plated carbon fiber</br>Quantity :4 black strap locks</br>high quality and testing is fine</br>Fit for all kinds of guitars</br>Since Dec. 23?? 2016?? we've improved our pack</br></br>Product Description</br></br>Package Includes: 4pcs strap locks</br><br/>http://www.amazon.com/gp/product/B01C4C3CQK