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A marble is a small spherical toy usually made from glass, clay, steel, plastic or agate. These balls vary in size. Most commonly, they are about 1/2 inch to 1 inch (1.3 to 2.6 cm) in diameter. (Wikipedia)
Lego 68 7 x 34 r wheel and tyre
Rubix cube 2
Neocube magnet bead
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