This set of three replacement O-Rings fits Backun Signature Bb Clarinet Mouthpieces. Available in three sizes (small, medium and large), the O-Rings are self-lubricating, which reduces friction when assembling the clarinet.
*Tip from Hawkins: To re-lubricate signature mouthpiece o-rings, use a drop of almond oil or a tiny bit of cork grease on the inner wall of the barrel top tenon to improve ease of use.
Measurements:
Small Bb O-Ring: 17.17mm x 1.78mm
Medium Bb O-Ring: 17.50mm x 2.00mm
Large Bb O-Ring: 17.30mm x 2.20mm
Note: All Backun Signature Series Mouthpieces come with medium-sized O-Rings installed, which fit a majority of clarinet barrel tenons.