This is a strap made with aquamarine (8mm), kyanite (6mm), and quartz (button cut). In addition to the strap shown in the image, you can also change it to an earphone jack or a lobster clasp at no extra charge. If you would like to do so, please let us know before purchasing. *This item is designed to be attached to zippers, etc., but please be careful as pulling on the strap may cause damage. *The color of the string is random. If you have a preference, please comment in advance. You can also change the stones or create a strap with your favorite types, colors, and stones with specific effects. In that case, the price will vary depending on the stones used, so please let us know before purchasing. We also offer a discount for bulk purchases. ☆After-sales service We provide after-sales service for all products. Material...Natural stone