The FA11431_LISA2-WWW-CLIP16-XP is a 9.9mm Wide Lens made of optical grade PMMA (Polymethylmethacrylate) with high UV and temperature resistance (105°C/220°F) and lens holder molded of high quality black PC (polycarbonate). It is specially designed for use with for Cree's XP-E series of LEDs. The fastening of holder to PCB with appropriate adhesive (e.c. epoxy or polyurethane based).