Baseline Goniometer 12 360d Plastic Maternity Care 18 x 16 x 2 Style:1 Pair (Left & Right) 18 x 16 x 2 * Proven design for pressure relief and position equalization * Position equalization results from the variable action of individual air cells * Adjustable air pressure provides relief based on user s individual needs * Easy to use air pump is included * Low surface tension reduces friction and skin shear * Low shear fluid proof cloth cover (not shown) protects against incontinence 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) Clear transparent plastic permits observation of joint s axis of motion and its range of motion * The 360¯ head has three scales calibrated to be used with the ISOM (International Standards of Measurement STFR) system * One arm has a linear scale in inches and centimeters * Scale reads 1¯ increments