International standard quality, Autoclavable,CE certificates, manufacturer price, Germany glass, fiber. The adapters can be unscrewed for three parts, different one can be matched with different type of light cable, 4mm*50mm, 0 degree, 30 degrees, 70 degrees.4mm*90mm, 0 degree, 30 degrees.4mm*110mm, 0 degree, 30 degrees.2.7mm*60mm, 0 degree2.7mm*90mm, 0 degree, 30 degrees2.7mm*110mm, 0 degree