The Lynx Recreational Vehicle Leveling Kit includes modularly designed levelers that fit any leveling function and hold a lot of weight. To use: simply set them into a pyramid shape to the desired height that the RV needs to be raised and drive onto the stack. The levelers can also be utilized as a support base for jacks or stabilizers. They are 8-1/2 inch x 8-1/2 inch with 1-1/2 inch thickness and provide 1 inch of lift. The 10 pack also comes in a convenient nylon bag and weighs less than ten pounds.