Replacement Casters only 4 for 7039 MJM Shower Chair Pk 4 Heart Rate Monitors Packing Content: Aluminum band assists in Packing Content: 14 x 5 x 6 Black Pebble * This spacious case is perfect for all medical professionals * Stylish and versatile * Made of quality grain leather * Nylon zipper all brass hardware and vinyl liner * 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 Double The Tread Surface For Superior Breaking *Easy Reach Brake Tab