Nickel plated O-ring snaffle bit with 4" twisted wire mouth. O-rings measure 2-1/2".
Dutton Three Piece Mouth with Rollers CCL-82/122
Dutton Sweet Iron Twisted Wire Dogbone with Roller Ring Snaffle R-82/12
BOB AVILA SLOW TWIST DOGBONE BIT
Short Shank Jr. Cowhorse Bit by Professional's Choice
Dutton O-Ring Slow Twist Dogbone Mouthpiece Bit R-64T-19