With the Glider Weights Set for Air Track, use weights to increase the mass of gliders.
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This air track accessory is used with the thread and pulley and includes four 5-g hanging weights. End pulley is pre-installed on the air track. Simply pass the thread through the holes on the end bracket and hang the attached weight to the end of the thread. One pulley, one spool of thread and four 5-g hanging weights included with AP5615 Air Track.