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Sedimentary rock set includes 10 sets of 7 specimens each (which measure approximately 2-inches by 1-1/2-inches) for a total classroom set of 70 individual rocks!! Includes sandstone, bituminous coal, dolomite, conglomerate, shales, rock salt, limestone, siltstone, arkose and alabaster. Warning: Chocking Hazard - Small Parts. Not for children under 3 years.