Standard 5" locking and swivel, heavy-duty casters and a built-in·stabilizer bumper give Armstrong carts mobility and stability, plus 16 colors to choose from (from top to bottom: SG - Sage Green, MG - Moss Grey, TC - Terra Cotta, SB - Slate Blue, L - Lavender, M - Mauve, Y - Yellow, CB - Taupe, T - Teal, B - Beige, AB - Crash Cart Blue, CR - Cranberry, BG - Blue Grey, HG - Hunter Green, AA - Deep Blue, AR - Red)