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 can supply you with satisfactory products and good service.

If you want more details, please feel free to contact us or visit our website.