Polypropylene (polypropin) material is hard to break, so you can check the amount of glue remaining; The width of the bottom is 4.3 inches (11 cm) so you can hold it with one hand to increase the safety of work on your scaffolding (Common Features) Roller used when applying rock wool ceiling materials; Easy to remove and clean after operation; The shaft is made of aluminum alloy for durability and long-lasting use; The original corrugated roller to prevent excess glue from splashing. Adopts fins, This reduces the splatter of the glue and prevents overglue, making it economical, and significantly improves your work efficiency. The lid prevents the glue from drying out. The lid also has a handle for easy carrying