Do your knees ache after riding?If so it's because you might be riding a western saddle and turning the leather fender where your stirrups hang. That won't happen with these camlock buckles. The camlock is made of stainless steel. The Biothane® straps are numbered on the inside for easy selecting of specific lengths. With these stirrup leathers you will not have the problem of stretching and they are so flat under your leg you won't even realize they are there. No more aching knees. Comes with a leather buckle sleeve cover. If you ride in denim, you will need stirrup strap covers.