Set up folding units by simply pulling up on the handle to open, then fold down to just 2" thick. Heavy-duty steel construction with powder-coat finish. Measures in inches and centimeters. Choose Solo (22"W x 9"H x 24"D; 20 lb) for individual testing or Dual (44"W x 9"H x 24"D; 40 lb) for two students to test simultaneously. Fully assembled.