The Floor Carrel and Add-A-Carrel create privacy for testing studying or other purposes. Purchase a Floor Carrel to start a row and then as many Add-A-Carrels as you need. GREENGUARD Indoor Air Quality Certified® and GREENGUARD Children & Schools CertifiedSM Constructed from 5/8" thick teak or cherry laminated particle board panels for excellent durability. Frame is black powder-coated steel and includes leveling glides. Retractable keyboard shelf measures 25-1/2"H x 31-3/8"W x 11-3/4"D. Work surface measures 29"H x 31-3/8"W x 23-7/8"D. TAA compliant.