Dear Sirs, We are a French manufacturer of Welding machines & battery chargers with over 40 years experience. To know more about our company, you may have a look at our website: www.gys.fr We have seen on DIN CERTCO lab website that your FS-2C4 filter is DIN CERTCO certified. Which model of welding helmets are made with this filter? Could you send us the datasheet of autodarkening helmet(s) using this FS-2C4 filter model? Could you also send us: - Copy of certificates: DIN certificate for 9-13 filters & EN175 for helmets - your quotation (USD FOB Shanghai price) Waiting for your reply, Best Regards, Sandrine BOUTIER China Assistant Tel. : +33 (0)243012850 Fax : +33 (0)243915591 Skype Login : sandrineboutier GYS 134 Bd des Loges, BP4149 53941 ST BERTHEVIN, FRANCE www.gys-soudure.com