Stubben's Sweet Copper Mouth Loose Ring bit will benefit your horse in more ways than one! Expect to find that your horse has better acceptance of the bit because sweet copper encourages the horse to chew, enhancing saliva production; the location of the copper link in the center of the mouthpiece also encourages horses to salivate because their taste buds are situated in the center of the tongue. Sweet copper has very high copper composition (90% Copper, 7% Iron + Aluminum, No Nickel) combined with very high strength. Ring-O 70mm, Thickness 16mm. Sizes 5", 5 ", 5 1/2", 5 ", 6".