The VSD provides excellent vestibular and proprioceptive stimulation. Controlled bouncing and vertical movement allows for appropriate levels of sensory input. Comes with 2 locking safety snaps & 4 industrial quality elastic loops. 2 single loops, each with a working load of 30 lbs. & 2 double loops, which have a working load of 60 lbs. per double loop. This setup provides a working load range of 30 - 180 lbs. You can add additional double loops in place of the single loops to increase the VSD's capacity to 240 lbs.