Vermil Thumb Ring - Classic Bronze - Premium Traditional Archery Equipment If you would like to add CZ-tone, please contact us via Amazon Messages. $5 per stone will be added good for protect the archer's thumb from arrow while the player is shooting (these ring have been handmade to the finest quality) suit for the Eastern traditional archery; for example, Korean, Chinese, and Mongolian style premium hand made of Thailand with various size and color of thumb ring robust as same as other materials and hard to brittle