Cheap And Discounts Prism Set Physical Optical Prism 6 Pieces 9 Pieces Hemisphere Triangular Pyramid Sphere Tetrahedron Cylinder Cubic Diamond Wholesale. Buy Directly From Merchant WALLY SKY WALLY SKY Optical Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.