IF YOU HAVE ANY QUESTION, PLEASE FELL FREE TO CONNECT ME FOR HANDMADE PRODUCTS,IT IS NORMAL FOR THE SIZE ERROR TO BE WITHIN 2’’(5cm)! Multi-colors 1818’’/1616’‘Soft Solid Seat Pad with Ties,Thick Chair Cushion,Plush Sofa Cushion,Office Seat Cushion,Floor Cushion,Chair Pad MATERIAL: Plush; ITEMS: Chair Pad; Colors: You have 5 colors to choose; SIZE: Diameter:16’’(40cm); Diameter:18’’(45cm); SHIPPING TIME: We need 1-2 weeks to made your order, & then it will cost about 1 week on the way. NOTE: Machine washable. IF YOU HAVE ANY QUESTION, PLEASE FELL FREE TO CONNECT ME I can accept cancel the order,but you need to connect me within 24 hours after you purchase the order; But,i can’t accept return or exchange after you receive the parcel:) Multi-Colors 1818’’/1616’‘soft Solid Seat Pad With Ties, Thick Chair Cushion, Plush Sofa Cushion, Office Cushion, Floor Cushion, Chair