10PCS 30MM Red Glass Crystal Diamond Point for Gift Box / House Decoration w/ Organza Bag
Material:K9 Crystal Glass
Package:Sheer Organza Bag
About K9 Crystal Glass
K9 is a Chinese Optical Borosilicate Crown Glass. It has low inclusions and bubbles. It is used for lenses and prisms for lasers and optics. It has good physical properties and can be polished like leaded glass. It also weighs approximately 15% less than full (24%) leaded glass (crystal). A US equivalent is BK7.