Standard Features: 2, 3, 4, 5, 8, 10, and 15 Row Units, 8" Rise/24” Tread, 10” Seat Planks, 17" Front Row Seat Height, Available in 15', 21', and 27' Lengths, Aluminium Frame, Single Foot-boards on Rows 2 & 3, Double Foot-boards & Risers on Rows 4 & Above, *Deluxe Model Features Double Foot-boards on ALL Rows