1Size: Each leveling block measures 8.5 x 8.5 x 1.3in. Stack the leveling blocks to the required height for custom leveling; Each square can add an inch to the height of the stack. 2Nonslip Design: These Camper Leveler blocks are made of quality material and are durable. Both the surface and bottom have a nonslip design to protect the tire from sliding. 3Easy storage: A storage bag is included with the package. When not in use, it can be put in a zipper storage bag with a handle, which is easy to carry. 4Instructions: Simply set the leveling block to a pyramid shape, depending on your needs, to the height needed for the Rv to be raised and driven onto the stack. 5Wide Application: Camping Leveling Block is suitable for car Rv trailer caravan single wheel and two wheel leveling.