Reinsman Western Dee Ring Snaffle- 3" rings, 5" mouth. 7/16" 3 piece with copper roller. 
 
"The Dee ring applies pressure to the horse's cheek on the opposite side of the face from the rein you pull to allow better flexion. Mouthpiece breaks over the bars at an angle to contact new nerves and add some tongue pressure for better control. Copper adds a sweet and sour taste for moisture and will also act as a pacifier for horses that chew on the bit."