50*50: Diameter 50 CM(20 Inches), Thickness 9 CM(4 Inches) Attention: There might be slight different in color, because of the computer monitor settings. Please refer to the measurement. Tiny measuring error is allowable in normal range. Material: Polyester.Package Includes: 1pc Seat Round Cushion Size: 40 X 40 X 9cm/16 X 16 X 3.5inch.Soft round cushion Effectively relieve sedentary cause hip fat accumulation, hip deformation, helps to shape the perfect hips. Solid Thicken Round Seat Cushion, Feel soft and comfortable, use of human ergonomics, reasonable supporting hips, relieve the discomfort of from sitting for a long time. Perfect for home, office and car, etc. Best gifts to family friend, it is not only good for chair, but also is used to decorative décor no matter where you put, like floor, sofa, living room, windows. Easy to clean: It can be washed by hand or machine washable.