ITEM NAME:30*30*60mm Triangular Prism BK7 Optical Prisms Glass Physics Teaching Refrac Cy.Material: Bk7(K9) optical glass, NOT plastic. Model: Triangular Prism. 1x triangular prism. This item is manufactured with premium glass for durable and long lasting use. It is easy to carry for photography, teaching, learning, presentation, etc.
