1" X 18" X 18" Upholstery Foam Medium Firm Foam Soft Support (Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement) Polyurethane Foam Density: 1.4 Medium Firm Density - Has a compression rate of 44 lbs Uses : Ideal for Square Chairs, furniture cushions, bench cushions, boat cushions, car cushions, back support, sofa seat replacement and all other home and commercial upholstery applications 100% Recovery Rate / Fire Retardant / High Quality / Professional Use Lasts 4-6 years