... model etc.Usage: to be used as optical parts of the telescope, microscope, camera, guns aiming scope, and measuring instruments, analyses ... refraction features; iIt can make the house look more brilliant. It can echo with metal ringing when struck. Handcraft made from lead ... brilliant and transparent, is to be used as decoration of the wall body and metope. 4.pPropertiesF4nd =1.62005vd =36.35nF ...