Turn your students into human gyroscopes with our stable rotating platform. Now you can do the "skater's spin" without skates, rink or ice! Our 16" (40 cm) wide bright blue wooden disc has a nonslip surface and safely holds up to 220 pounds (100 kg). Intended for hands-on (or feet-on) use, it has very low friction with a weight of 100 pounds. Instructions with theory and sample questions.