Whats the difference between the Plastic and Silver model?
The main difference is weight. The plastic model is much lighter than the plated brass models. The extra weight of the silver version (the most popular model) enhances the workout when supporting the small end of it in your chops. The Plastic P.E.T.E. is made of black delrin. Placing the disk behind the lips and pulling the exerciser forward prompts an isometric response from the muscles of the lips, preparing them for the forces encountered in brass playing. The P.E.T.E. directly targets the exact muscles that tire toward the end of a performance. These are the muscles which prevent the lips from falling into the cup, blowing apart, and losing the buzz.