580 sheets (1.2 oz/sq ft (64 g/m2)), 4 steps for C844dnw/C835dnw/C824dn and 3 rows of C835dnwt. When using it on the floor, please attach the dedicated caster base (optional). If the extension tray unit has been added to 3 or more levels, please make sure to set the "Fall Prevention Foot" on the dedicated caster base (optional).