These Midwest Tiered Tapered Standing Choral Risers can be arranged in a semi-circle for optimal stage presence for all performers. A solid plywood core deck, supported by a steel frame & braced with spring-bolt locks accommodates heavy loads safely. Same-height risers are easily attached with drop-in coupling for increased stability. Convenient caddies accommodate up to seven 3-level risers sets for compact storage and efficient transportation. 2 Level accommodates 9-12 people; 3 level accommodates 12-17; 4 Level accommodates 16-22. Available in 2, 3, or 4 levels with hardboard, carpet, or polypropylene deck.