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A transparent frame containing magnetic particles in a water based solution for showing magnetic field patterns. When a magnet is present the particles of iron inside become slightly magnetized, so they attract each other and cluster into the lines that show the magnetic field patterns. The kit contains: a field pattern window, 2 plastic coated magnets, 2 ferrite magnets, information/instruction booklet. Entire kit is CE certified. Size: 8-3/4" x 4-3/4" x 3/8" (220x120x9mm).