More robust and long-lasting than wood, they are resistant to splitting, chipping, or peeling. Measurements (Open): 30" Length x 20" Width x 21" - 28" Height (76.0 cm Length x 49.5 cm Width x 53.0 cm - 71.0 cm Height) Measurements (Closed): 40" Length x 20" Width x 2.75" Height (101.6 cm Length x 50.8 cm Width x 7 cm Height)