Collegiate One Sided Rubber Reins Black. Collegiate have searched far and wide to bring you the best quality European leather they could find. Partnered with stainless steel fittings, the One Sided Reins reflect quality and durability. With a combination of plain leather on ones side, and a rubber grip on the other, One Sided Rubber reins provide a secure grip no matter the conditions. Alongside buckle fastenings and a central buckle, the One Sided rubber Reins are a tack room essential.