POWER RING Ligature models are now available for most JodyJazz Mouthpiece models including HR*, HR* CUSTOM DARK, DV, DV NY, DV CHI, JET and SUPER JET. The size and taper of each of the POWER RING Ligature models is perfectly designed to be an exact fit with the designated JodyJazz mouthpiece. The POWER RING simply slides over the reed and becomes very secure as it is pushed tightly over the reed.