Geometry Resource Kit, includes: double sided geoboards(12) with rubberbands, one overhead geoboard, shape tracer set, pattern blocks, over head pattern blocks, tangrams (16 puzzles), overhead tangrams, a Tangramables book, a Let's Pattern Block It book and geoboard dot papers
Rectangular Refraction Cell, Material: acrylic rectangular, Color: clear, excellent for showing refraction and internal reflection in water, and to measure its refractive index, has uniform wall thickness to eliminate distortions, Dimension: 6X3X6.2 CM