Curity™ NonSterile USP Type VII Gauze Sponge, 4 x 4 Inch, 1 Bag of 100 Exercise Ball Accessories Massage setting to relax lower Bell Horn 18mmHg AntiEm Massage setting to relax lower back or neck * Can provide relief from conditions aggravated by poor posture * Place between your knees while lying on your side for a more comfortable sleep * Can be used in combination with the ObusForme© Highback Backrest Support or your car s headrest for added neck support * Made with polyurethane foam * Elastic strap holds the ObusForme© Supporting Roll with Massage in the position you desire * Brushed polyester cover can be removed and sponge washed * Small lightweight and portable for use anywhere you sit at home in the office and on the go * Battery Operated 4 AA batteries (not included) * Shower chair 18 internal width 3 x 1 1 4 heavy duty THREADED stem casters with double drop arm option * 300 lb 4 x 4 inches USP Type VII: USP means gauze sponge meets United States Pharmacopeial Convention standards