2cm Optical Glass X-Cube Prism RGB Dispersion Prism for Physics and Decoration Same Size 3pcs industrial Adjustable Headband Coming with a

Adjustable Headband Coming with a strong hook and loop feature

or your case

Fits for the diameter of sign holes from 2/5” to 3/4”

Huge IC Assortment contains: PC817

2cm Optical Glass X-Cube Prism RGB Dispersion Prism for Physics and Decoration Same Size 3pcs industrial Adjustable Headband Coming with a2cm Optical Glass X Cube Prism RGB Dispersion Prism for Physics and Decoration Same Size 3pcs Product Features Material: Optical glass Size: 20mm*20mm*20mm 0. 8'' x 0. 8'' x 0. 8" (Pay attention to the size, it's small.) It's a nice demonstration of beam splitting and color combinations. This prism is 6 sides polished, much more beautiful than those with 4 sides polished. Package Includes 3x Optical Glass Prism RGB Prism