The Square Kevlar Cord is one of most popular roller ropes adopted by the mainstream brands of glass tempering furnaces. The square shape of rope has the best surface of contact and support to metal roller and glass sheet. The typical size of 5.5 x 5.5mm was firstly used in Tamglass furnace of Finland decades ago. Our standard package of 5.5mm kevlar cord is each 250 meters per roll. Nowadays, most of well-known tempering furnace OEM still choose the square cords for wrapping the quenching rollers, like Northglass, Glaston, Landglass, etc. Besides 5.5 x 5.5mm, we have more sizes available as below,