Polypropylene (Polypro-pin) material that is hard to break and can be seen on the remaining level of transparency. The width of the bottom is 4.3 inches (11 cm). It can be carried with one hand, and is more safe to use on scaffolding. Common Features: The roller is used when applying rock wool ceilings. It is easy to clean after work, and the shaft is made with aluminum alloy for long use. The original wave roller is used to reduce the amount of splash-proof fins. less bounce Prevents overglue, economical and improves work efficiency. Comes with a lid that prevents the glue from drying out. The lid also has a handle for easy carrying.