The snaffle curb strap by Martin Saddlery is made with Hermann Oak harness leather and features stainless steel buckles for easy length adjustments. The leather curb allows you to apply pressure without a harsh reaction. Snaffle Curb Strap with stainless steel buckles. Martin Saddlery strap is hand-oiled and hand-finished the traditional cowboy way. Some variations in leather tones may occur.