The piano moving straps are designed to secure pianos while transporting. The piano moving straps are made of cotton webbing so they are soft and gentle on delicate surfaces, but are also strong enough to be used when moving appliances or furniture. Since they are made from cotton they are softer than standard polyester or nylon straps, or rope, which makes them ideal to use. The piano dolly straps come equipped with a slide roller buckle on one end and metal tip on the other end of each strap. The roller buckle is used to keep the strap secured while moving your item. Threading the roller buckle is easy! Simply feed the metal tip from the bottom up behind both the rollers, then feed the tip between the two rollers and pull tight. This 2" x 15' Cotton Moving Straps are a must have when moving delicate items!