Rectangular Refraction Block, 3" (75mm) x 2" (50mm) x 0.7" (18mm) - Acrylic - Slightly Beveled Edges - Excellent for Physics Experiments & Photography - Eisco Labs industrial_Oct2022 That's because of our patented

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3 feet up to 20 feet)

Measures 20'' x 36''

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Basic Features 10 Jumbo Pencils and 1 sharpener for BeginnersHigh-Quality Wood for Easy SharpeningLarge Diameter (0

Rectangular Refraction Block, 3" (75mm) x 2" (50mm) x 0.7" (18mm) - Acrylic - Slightly Beveled Edges - Excellent for Physics Experiments & Photography - Eisco Labs industrial_Oct2022 That's because of our patentedRectangular Refraction Block, 3" (75mm) x 2" (50mm) x 0. 7" (18mm) Acrylic Slightly Beveled Edges Excellent for Physics Experiments & Photography Eisco Labs Product Features RECTANGULAR BLOCK Rectangular block made from high quality acrylic 3" LENGTH Block measures 3" long, 1. 5" wide and is 0. 7" thick PHYSICS EXPERIMENTS Excellent for physics classrooms. Ideal for a variety of experiments in refraction and reflection PHOTOGRAPHY Great for