Alaska packages come standard with galvanized shaft, standard bearings, galvanized bearing plates, standard drums, stainless steel cables, stainless steel rollers, galvanized hinges and standard 5-wall polycarbonate sections. ADDER FOR STRAPEZE – Eliminates torsion springs and utilizes a strap counterbalance system with stackable weights. ADDER FOR EXTREME PACKAGE – Includes stainless steel shaft, stainless steel bearings, stainless steel bearing plates, e-coat drums, plastic hinges and stainless steel fasteners. ADDER FOR FULL VISION SECTIONS – Includes 1/4” solid polycarbonate for see-through visibility. ADDER FOR PLASTIC TRACK – Includes plastic rails and stainless steel mounting angles.