Our own import of the original BJ Long rubber pipe bits or softy bits as many call them. Soft live rubber pipe bits which you use to cover for the end of the mouthpiece to prevent stem damage and/or protect your teeth. Many people find these easier to grip and more comfortable than acrylic or ebonite stems towards the teeths. If you are one who from time to time sell your pipes as Estate (used) its easier to sell them if you have used rubber bits. You recieve two pieces per bag.
A trick is to dip the rubber bit in medium warm water before putting it on the stem. It makes the rubber soft and more flexible.