Rugby® Cholecalciferol Calcium Citrate Joint Health Supplement, 1 Bottle Foot Leg Lifters Take it to work use Imaging Take it to work use it at home or while traveling Replacement Caster 4 *Twin Wheel Casters Have Threaded Stem For Extra Security And Safety *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) *Quiet Mobility (Hard Treads Make A Lot Of Noise)*Non Rust Plastic Body And Wheels *High Load Capacity (160 lbs) *Non Slip Tread 100 tablets per bottle 250 IU of cholecalciferol (vitamin D 3) and 200 IU of calcium citrate per tablet