Yamaha Trumpet Silicone Slide Stopper Prevent unwanted dents and dings from slippery slides with Yamaha’s Silicone Slide Stopper. New for 2015, the stopper is made from silicone rubber, which prevents the slides from coming away from the trumpet.The slide stopper is designed to prevent the 1st and 3rd slides from slipping off. It is made of silicone rubber, which will not harm the finish. Providing both strength and elasticity, it can remain attached to the instrument during performance. It is possible to use it in three different positions.