All aluminum seat planks and understructure provide a lightweight, stable bleacher that is easily tipped for mobility. Seat planks are 10" wide non-skid aluminum. Transition foot prevents floor marking with four 4" non-marring swivel casters. Powder coating available in 12 colors. Shipped freight. Made in the USA. In Comments section of Checkout, please indicate both the plank color & the understructure color. Color options: orange, dark green, gold, white, maroon, yellow, black, grey, navy, red, kelly green, and royal blue.