Optimum Opt Brand. Vinyl Leather 4PC Set Front Car Seat Covers for BMW 550i 640i 650i 750i 750Li X3 X5 X6 320i 328i 428i 530i 535i 540i 435i 528i, Blue/Black Color. 77153-BU !!!IMPORTANT!!! The cover is only suitable for the configuration as shown above with the green checkmark. They will not work with racing seats or seats with any type of seat belt built into them. Package: 1 Installation Sheet; 1 Bag of Mounting Hooks; 2 Low back seat cushions (will not work on high back seating or seats with non adjustable headrests); 2 Separate standard sized headrest covers Material: Our seat covers use a special synthetic leather (not fabric) that is softer than standard vinyl with a slight luster on seating areas of seat covers. Front seats will have a lycra/polyester backside in matching colors that will snugly conform to the back of the seats. Material will stretch down behind the seat for full coverage. Installation is easy with our pre-sewn elastics straps and mounting hooks (also provided) Care and Cleaning: Spot Clean Only Size: Semi Custom Low Back Universal Fitment. #Surface Finish: Artificial Leather.