A break through in balance board design! Features snap-in, add-on fulcrums to increase the height and tilt angles to challenge users as their skills increase. Also features an embedded “s” track with catch-basins on each end. Smooth and controlled tilt changes allow a ball to stay on the track on roll from one catch basin to the other. A fun, kid-friendly design includes oversized feet platforms. High-impact molded construction with ribbed underside beams for strength. Each single board set includes 2 add-on fulcrums for three height levels. The three board set includes 3 fulcrums so that each board can be set at a different height challenge. Works best with 175 lbs. limit. S-track designed for whiffle golf or ping pong balls (sold separately). Skill builder guide included.