Hydrocollator Heat Pack Knee Shoulder 10 x 20 Work Taping Tables 50 YARD DISPENSER BOX * 413116 50 YARD DISPENSER BOX * XXX Heavy Silver * A special system of progressive resistance * Can be used for both the upper and lower body muscles * Approved for use by the APTA * MJM's Exclusive Reinforced Caster System Allows Additional Structural Support To Our Entire Product Line Our Positive Engaging Lock Holds The Wheel Securely So There Is No Swivel Movement When Locked * The Unique Design Allows Easy Movement On Hard Surfaces And Helps Eliminate the Wheel From Falling Into Cracks * Soft Non Marking Tread * (It Will Not Leave Black Marks Or Leave Groves In Wood Or Vinyl) * Quite Mobility * (Hard Treads Make A Lot Of Noise) Non Rust Plastic Body And Wheels * High Load Capacity (160 lbs) Knee Shoulder 10 x 20 * Can be immersed in water or microwaved * Provides up to 30 minutes of soothing relief * Durable convenient and economical * Guaranteed for one year *