The Original Marlene Bit The slightly curved shanks and a short gag motion help maintain good flex and bend with the three piece mouth piece and side-to-side independence. The three piece mouth design lies well across the tongue and bars of the mouth providing comfort and relaxation. You will get even flexion on both sides with a three piece mouth. I like to use this as my transition bit from a D- ring and for getting a horse used to a curb chain. The gag loop is great to use a German Martingale with.