1.Material of the wheel is nylon. the hull is made of iron with galvanized 1.The material of the wheel is nylon the material of the hull is iron with galvanized.2. different colour of wheel is available.3. this kind of roller is durable and applied.and also fray-assisted.ue company specilizes in accessary for door & window. and we have been in this line for many years.You can rest assured that we ...
