Description Optical Crystal Presentation Box Sizes: OCST61 (small): 6" x 3 1/2" x 2 1/4" Optional base: BCTB08 OCST71 (medium): 7" x 3 1/2" x 2 1/4" Optional base: BCTB07 OCST81 (large): 8" x 3 1/2" x 2 1/4" Optional base: BCTB06