Staging 101 Choral Risers are constructed high quality plywood and steel and feature a 10 year warranty. Choral risers are 6'' x 18'' (1.8m x .45m).What makes Staging 101 risers unique is that straight and wedged sections can be combined together easily to form different configurations (many competitor's risers do not have this option). 4 tier wedged choral risers consist of 4 seperate riser panels in 8", 16", 24" and 32" in height. They are available in a Carpet or Industrial finish and with or without a rear guardrail option. You can also purchase side guardrails as an additon. Please choose from the options available.