Compatible with Series 4/5/6 & SE, Size 44mm. Physical Vapor Deposition (PVD) Coating (Chameleon Iridescent). PVD metal ceramic film exhibits a high micro-hardness (1500-8000 HV), in excess of 80 HRc. ISOfrane Band is Hypoallergenic, with a superior fit and feel and 100% Silicone free! 100% Manufactured and PVD Coated in the United States of America. Rowe Tactical - Rowe Shield is not responsible for improper installation.