Antdle Stair Treads Carpet's design is simple and practical .Durable non-slip backing which does not require rug gripper,comfortable surface that provides an anti-fatigue feature. Extend the life of your high traffic hardwood stairs.Perfect for your family ,pets and treads . Washing instructions: -Can be washed in a large machine or by hand -Do not use hot water to clean stair treads -Can use some neutral cleaner appropriately, do not use Acidic and alkaline detergent, because it can accelerate aging of the stair mats NOTE: As the shooting light, angle and color displays, physical and photos maybe a little differences in color and 1% error in size,it does have a little sparkle from a metallic thread. When you first open these stair treads carpet,they will have some chemical smell.Don't worry about that,it's normal.You just air them out on your deck for a day to rid them of the smell.