The Blue -InchSnap-On-Inch Reeds fit the Terminator, the Pack Bugle and the Bull Horn. Blue -InchSnap-On-Inch Reeds are molded from silicone. Silicone won-Feett rot like latex and they-Feetre easy to use...just snap -Feetem on and you-Feetre ready to go. There-Feets no stretching or frustration trying to tune your call.