The secret behind the Slide-On Kisser Button is the unique blend of materials that make up the kisser button. The material is soft while others are hard plastic. Hard plastic does not allow you to flex into position. With the Pine Ridge Archery softer, yet super-strong material, the kisser is flexible and more comfortable on the lip. The Slotted 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! These innovative designs 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.