Soft, molded material. Inside rails fit snugly against mouthpiece. Will not scratch your mouthpiece. Will not crack or chip if dropped. 
 
The D'Addario mouthpiece cap for Baritone is made of flexible material and features rails that fit snugly against the mouthpiece. That way, if you accidentally drop your mouthpiece cap, it will not break or chip.
 
The nickel-plated Rico ligature for Bass Clarinet is designed with a four-point inverted design to provide you with excellent response and function at an affordable price.
Fits most hard rubber mouthpieces
Four-point system applies equal pressure to the reed
Two-screw, inverted design
Nickel-plated
All D’Addario reeds are designed and manufactured in the USA from naturally-grown cane