Circuit Training Class Packs make ordering easy. Enough for 18 students. Pack includes exercise tubes of varying resistance and 2 kinds of Hot Spots™. Big Ball Caddy available separately (holds 9 balls; order two caddies for the 18-ball pack). 18-student pack includes: • 18 22" Anti-Burst balls • 4 light resistance tubes • 10 medium resistance tubes • 4 heavy resistance tubes • set of 12 Exercise HotSpots • set of 12 Tubing HotSpots (9-student class pack pictured)