... , stick, strip, ball, second model etc.Usage: to be used as optical parts of the telescope, microscope, camera, guns aiming scope ... etc. 2. crystalloid Crystalloid glass: lead Lead crystal glass, also known as man-made crystal, it is of high transparence, cleanness and ... brickArt glass brick, brilliant and transparent, is to be used as decoration of the wall body and metope. 4.pPropertiesF4nd =1 ...