Replacement Casters only 4 for 7039 MJM Shower Chair Pk 4 Thumb Braces Supports Comes complete with two sound 17170 Comes complete with two sound heads that can be plugged in simultaneously for more targeted therapy * Simple to operate the user can switch between wands with the single push of a button * Two channels of electrical stimulation output * Large easy to read graphical LCD display with exact dial performance and programmable timer * Waveforms include TENS EMS 2 Pole Interferential 4 Pole Inteferential and Russian * Dual clinical ultrasound features a 5 cm sound head which offers 1 MHz and 3 MHz frequencies * Ultrasound has 10% 100% duty cycle selections * 10 presets per waveform totaling 50 in all * 20 ultrasound presets * User defined memory positions for user protocols * Designed for tabletop therapy cart or mobile use * Includes eight sets of electrodes eight sets of rubber electrodes with sponges eight straps four sets of lead wires and a user manual * Product dimensions: 10 Replacement Dual Usage Deluxe Elongated Open Front Soft Seat w Removable Center 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