This O-ring is made out of 5/16" diameter material. 2 7/8" outside diameter against the extra weight in the compactness of the ring allows for a more stable feel and quick release. Two-piece twisted wire mouthpiece is more aggressive than a smooth mouth.
Mouth: 5 ¼” Rings: 2 ½”
Mouth: 5 ¼” Rings: 2 ½”