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For demonstrating the inelastic impact with two measuring trolleys or with the gliders of the air track; One attachment with hollow metal cylinder filled with plasticine, second attachment with needle, each with 4 mm plug pin, attachable to measuring trolleyDimensions: D=12 mm, L=65 mmMass: approx. 20 gadditionally recommended:2 x P1311-2A Trolley, mass of 50g, very low friction