Portable choral standing risers by are easy to set-up and allow for quick arrangement for all performance venues. Units easily attach to one another to provide multi-level heights. These risers are durable and safe, built with 16 gauge steel frames and 14 gauge tubular legs. The legs are outfitted with spring-loaded easy to open/close support brackets, allowing them to be easily opened/close for quick set-up and safe use. Guardrails are recommended for safety.