PACKAGE QUALITY: The product has 10 interlocking horizontal blocks,4 black ramp , and a bag. Product installation instructions, two carrying blocks marked①and②, there are 4 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. Bright color design, so that you can use it under dim light, and you can also see it | INSTRUCTIONS FOR USE: Simply set them into a pyramid shape to the required height that the RV needs to be raised and drive onto the stack. Each set comes in a zippered storage bag with a handle for easy carrying | WILDY USE AND LIFETIME WARRANTY:Homeon Wheels RV leveling block can be used with single wheels, double wheels, tandem wheels, tongue jacks, 5th wheel jacks, hydraulic jacks, and stabilizer jacks. If you experience any issue down the line you are guaranteed a free replacement or complete refund. If you have any questions after receiving the product, please contact us to help you solve them in time