The Slide On XL Kisser Buttons are made of soft material, so they can slide right over the loop in the end of the string making installing the kisser easy when the string is removed from the bow. This is great when getting a new string or changing it for any reason. These are also great for traditional shooters! This innovative design can quickly be put on the string, saving archers and pro shops time. They are soft so they won't irritate the corner of the mouth and they look great. The Pine Ridge Archery Kisser Buttons also help eliminate bow string noise and squelch string vibration thanks to the soft, durable material they are molded from. Available in 8 hot colors so an archer match their accessories. Colors Available include: Black, Red, Blue, Orange, Lime Green, Pink, Purple, and Yellow. Weight (each): 5.4 grains (approx.) Diameter: 11/16" or 17mm