Centaur® Stainless Steel Corkscrew Copper Mouth Full Cheek BitCentaur full cheek single jointed snaffle with copper corkscrew mouth. The textured corkscrew mouthpiece puts greater pressure on the tongue, while the copper encourages more salivation to keep mouth softer. The full cheeks provide increased leverage. Don't forget the bit keepers, like the Nunn Finer Leather Bit Loops, to keep the full cheeks in a stable position on horse's bridle.