Detailed Product Description 1. Optical glassType: KZKBaKHBaKFZFAvailable specificationsSpecifications available: board, block, stick, strip, ball, ... second model etc.Usage: to be used as optical parts of the telescope, microscope, camera, guns aiming scope, and ... kinds of low-lead and medium-lead crystalloid glass.3. art Art glass brickArt glass brick, brilliant and transparent, is to be ...