Warburton Special Optimum Pressure System - Special OPS BR_ED_INST is highly effective and easy

is highly effective and easy to apply

Reduces potential frictional noise

Protec Padded Back Pack Straps

Built in backpack straps and rain cover complete this compact and lightweight bag

Fits even the largest of valves including Thayer valves

Warburton Special Optimum Pressure System - Special OPS BR_ED_INST is highly effective and easyWarburton Special O. P. S Optimal Pressure System There's no such thing as "no pressure" when it comes to playing the trumpet. However, too much pressure is a familiar problem with most players at some point in their playing career. The specially designed Optimal Pressure System fits right into your trumpet and works with your normal mouthpiece top to teach you to use less pressure while actually playing!