Rectangular Block - Acrylic, Size 100 x 75 x 18 mm-EIS-PH0568B offers a thoughtfully designed, durable resource for hands-on learning. Rectangular block made from high quality acrylic Block measures 4" long, 1.5" wide and is 0.7" thick Excellent for physics classrooms. Ideal for a variety of experiments in refraction and reflection Great for photography lighting and distortion effects Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind Single rectangular block made from high quality acrylic. Block measures 4" (100mm) long, 1.5" (75mm) wide and is 0.7" (18mm) thick. Excellent for physics classrooms. Ideal for a variety of experiments in refraction and reflection. Great tool for photography effects. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.