IPL filter is the key optical element for IPL (intense Pulsed Light) machine, which filters the UV wave and reserve the useful wave from 400nm to 1200nm for cosmetic laser, such as photrevujenation, hair removal, vascular and acne treatment. The available wavelength are 550, 560, 570, 590, 615, 645, 695, 755,780 nm Material:……………………………BK7 Grade A optical glass, Fused silica, Sapphire crystal. Dimension Tolerance:…………… +/-0.1 Thickness Tolerance:……………+/-0.2 Surface Quality:……………………60/40 Clear Aperture:……………………>90%...