Patented Silicone Reeds with the Perfect Tension Built-In. Reeds are Pre-tuned and Will Fit the Baffle Bugle, Pack Bugle and Bull Horn. There is no adjustment needed - these reeds are Pre-tuned! The Blue "Snap-On" Silicone reeds have perfect tension and tone every time and silicone won't rot like latex. These reeds fit the Baffle Bugle, the Pack Bugle and the Bull Horn and unlike latex reeds, they can last all season long.