I previously destroyed a tire attempting to remove it using makeshift tools so I decided to buy these levers. I was able to easily remove an extremely tight pair of beaded clincher style tires without causing any damage whatsoever. I particularly like the cutout on each lever for locking them onto the spokes; it frees up my hand and I can insert the next lever without it popping off. The levers are flexible but seem to be made from very durable plastic. The hooking ends are pretty small compared to other brands but it works fine. Overall, I am happy with this product.