The BodyKore Selectorized Bicep Curl machine is a commercial bicep building machine. The pivoting arms allows the user to get a full extension and engage all of their biceps muscles during the exercise. The seat has a 8” seat length adjustmen to users of all heights can use the machine. The stack weight is easily accessible from the seated position so the user can increase/decrease weights conveniently between reps. The machine comes with a 220lb weight stack that is upgradeable to 340lbs.Dimensions: Base: 45" x 47" Height: 65" Weight: 480lbs Construction: Frame Material: Heavy-duty commercial-grade steel tubing Finish Options: Black or silver powder-coated finishes Pulley System: Single pulley with a 2:1 weight ratio Cable: 2000 lbs tested, nylon-coated high-tensile aircraft cable Pulleys: Fiberglass-strengthened nylon pulleys with sealed ball bearings Weight Stack: 220 lbs precision-milled steel plates (optional upgrade to 340 lbs available)