The round cap is made of composite material, which is composed of 40gPP + 20gPE. Does not irritate the skin and is comfortable to wear. The automatic machine mechanism is adopted, and the environmental protection rubber bands are very firm and not easy to fall. Applicable to electronic manufacturing, dust-free workshops, catering services, food processing, schools, locomotives, spray processing, stamping hardware, health centers, hand-processing industries, hospitals, beauty, pharmaceuticals, factories, environmental cleaning, public places, etc multiple uses.