Pneumatic Stool w o Back Aluminum Base Hearing Aid Combines the skin soft tissue protection Aluminum band assists in Combines the skin soft tissue protection and Shape Fitting Technology© of a ROHO DRY FLOATATION© cushion with stability from a contoured foam base * This cushion design allows for improved pelvic alignment and stability for improved position and function while maintaining optimal immersion and envelopment of both the ischial tuberosities and greater trochanters * The ROHO shape fitting cushion insert provides critical pressure redistribution around the pelvis area giving the individual skin soft tissue protection that ROHO is known for * Simply adjust the cushion insert to fit the individual output level ≤125+3dB Max OSPL90 ≤125+3dB Average OSPL90 118±3dB Max Gain 45±5dB FOG50 HFA Avg Premium 23 die cast aluminum base with satin finish top * 5 leg design for greater stability * Full size diameter top and base for comfort and stability * 4 thick seat for extra comfort * Black hooded dual wheel nylon casters * Pneumatic height adjustment * All seats have 3 4 thick solid plywood base * Lever controls height * Knock down design saves on shipping * Easy no tools required assembly * Premium stain resistant woven knit backed vinyl upholstery * 250 lbs load capacity under normal use