PACKAGE QUALITY: The product has 9 interlocking horizontal blocks,3 black ramp , 1 Wheel Chock and a bag. Product installation instructions, two carrying blocks marked and , there are 3 anti-skid pads underneath, when storing them in the bag, please put these two carrying blocks on the bottom, because they can t be stacked SUPER MATERIAL AND NON-SLIP RADS STRONG: These camper levelers blocks are made of high-quality material for years of rugged use. A Solid bottom structure prevents them from sinking on soft ground. The black ramp can effectively help the tire to quickly drive into the leveling blocks you can stack the product according to your needs, with strong fastening force, effectively protecting the wheels from sliding PRODUCT SIZE: Each leveling block: 8.5-inch x8.5-inch x 1.3-inch and black slanted sliders:8.5-inch x 4.2-inch x 1-inch. Each block adds a full inch to stack height. Conveniently packaged and easily stored in a bag.