Consists of:
4 x Rollers
Installation Kit
Fitting Instructions
Materials used:
Black powder-coated high strength steel
Black HDPE Rollers 
Product Dimensions:
108.5mm (4.3") x 81.5 (3.2") W x 53mm-80mm (2.1"-3.2") H
Weight:
2.4Kg (5.3 lbs)
Load Rating: 
140Kg (308.7 lbs) Distributed over a minimum of 4 rollers