McBride Donut Side Reins (by Smith-Worthington)McBride Donut Side Reins helps develop correct head set and muscles needed for horse to be in proper balance. Rubber donut offers some give and is gentler to your horse. McBride protective and training gear is made of the finest English and European leathers and stainless steel hardware. Full, top grain leather is the strongest, most durable part of leather. McBride leather is aniline finished never pigment (painted) finished. (Paint can cover flaws