The SportsArt DS972 Dual Stack Functional Trainer offers a unique adjustable pulley ratio (1:2 and 1:4) giving users more workout options and increases weight selection options. Dual weight stack; Adjustable 1:2 and 1:4 pulley ratios; 41 pulley positions offers more workout positions and versatility; Integrated pull-up bars; Magnetized weight selector fork with retracting cord; 7-piece accessory set included; Deep-groove, 5-inch (12.7 cm) shrouded pulleys provide faultless cable tracking; Internally lubricated 2200 lbs (1000 kg) steel aircraft cables provide quiet, smooth operation.