Adjustable positions on all machines to accomodate all users to ensure correct biomechanical function. Adjustments are made with heavy duty spring loaded pull pin knobs. Weight stacks are adjusted with tethered, magnetic selector pins that extend through the entire weight stack. Cables are 3/16" thick 4800 lb. test military spec galvanized oil impregnated air craft cable finished with a tough nylon coating ¼" thick. Manaual tension adjusters on every machine for the cable adjustments. Weight stack plates are solid steel machined precisely to correct weight. Weight stack is accessible from a seated position. Performance Plus placards used to preform correct usage for each machine along with anatomical highlights to show which muscle groups are being worked. Each machine is made with a lower starting weight stack and has counter balanced arms when needed. Premier heavy duty 40 oz. commercial grade marine naugahyde, Federal specifications AA-2950A (supercedes CCCA680a), Federal Aviation Admin. FAR 25.853 (b) & appendix F part 1 (a) (i) (ii) (v), Boston Fire Code (BFD IX_1), Port Authority of NY & NJ, bacteria resistant padding is 3" closed cell high density foam reinforced with ¾" thick plywood back support. Guide rods are 1" CCRO ANSI 1045, solid steel hard chrome plated with tensil strength of 75,000 psi. Frames are constructed of high stress 3/16" ASTM A-500 grade B structural steel tubing (11gauge). 2" x 4", 2" x 3" tubing is used on all uprights, 2" x 2" x 1/8" ASTM A-500 grade B structural carbon steel tubing (11 guage) is used on cross members and benches. All welds are ground down and stress tested. 3 stage preparatory process that includes a state of the art wash system that paralyzes the material. Then the material is processed through a dryer to dry the material. It is then sent through a preheat stage before it has the magnetic paint powder applied. Urethane foam grades are a minimal grading of HR-125 with a density pcf of 2.60 +/- 0.10 & in high compression areas HR-150 with a density pcf of 4.60 +/- 0.30. Cams are computer designed and laser cut to exact shape to allow proper variable resistance throughout the exercises complete range of motion. All cams are ¼" thick solid steel. The cams are different for each machine to provide the correct movement for the exercise. Shrouded pulley housing is 6" x ¼" thick solid steel. Pulley wheels are 4½" and 6" solid fiberglass reinforced body with a ½" cable groove. Oil dipped double sealed racer ball bearings with a ½" axis shaft hole. Sealed for moisture and dust proof.