JT Spectra Thermal Lens Smoke Gradient 372.17 DKK 297.73 DKK Double lens (Thermal) for all spectra masks such as Proshield, Proflex, Flex 8 mm. BUY Share Article Number: 4947 Information Reviews Double lens (Thermal) for all spectra masks such as Proshield, Proflex, Flex 8 mm.