DOUBLE NON-SLIP DESIGN: XUMAKI RV Leveler has a gear meshing system design to prevent tire slippage. Two rubber anti-skid pads further ensure that the leveling system does not slide with the ground..HEAVY-DUTY CONSTRUCTION: Camper leveler is made of high-performance polymer for durability. Our camper leveler is suitable for any trailer up to 35,000 pounds with tires up to 32 inches in diameter..2 PACK RV JACK PADS: RV jack pads are designed with a reinforced honeycomb structure to prevent RV fifth wheel stabilizers, hem stabilizers, jacks from cracking or sinking into soft ground..FAST & PRECISE LEVEL: Simply level your RV any increment between 1/2" and 4" in less than 5 minutes. Level your camper, RV, or trailer by simply driving on until level..NO NEED TO TRIM: Compact length makes this rv leveler compatible with dual axle tandem wheel RV without modification. It can also be used as a wheel chock..WHAT YOU WILL GET: 2 Curved Levelers, 2 Jack Pads, 2 Chocks, 2 Anti-Slip Mats, 1 Carry Bag. If you have any question, please don't hesitate to contact us, we will get back to you within 24 hours.