Hign-concerned Chemical:None Material Type:POLYESTER Origin:Mainland China CN:Guangdong Fit for helmet model:K5,K5S,K3SV,K1 Product type:Helmet lens anti-fog sticker Please note: Our anti-fog film is 31.8cm in length and 9.8cm in width(due to manual measurement, there may be slight errors), It does not fit K1S original visor. It fits most of K5 K5S K3SV K1 helmet visors, but we have received feedback from some customers that it is short, and it does not fit some customers' visors, so please check the product size carefully before purchasing to avoid wrong purchases. Since this is a very low-profit product, we no longer accept disputes due to size issues, please understand. Working temperature: the product can only take effect between - 10 and 50