Key features Adjustable Height for Flexible Leveling: Customize your setup with multiple stacking options (6+6 or 3+3+3+3) to level single, dual, or all wheels. Ideal for travel trailers, campers, fifth wheels, and RVs. Suitable for use under RV wheels, trailer jacks, stabilizer jacks, and campsite leveling needs Heavy Duty & Long-Lasting Performance: Made from durable performance polymer for reliable strength and long-term outdoor use. Designed to support heavy loads with a sturdy structure that delivers dependable leveling and stabilization for every trip Interlocking Design for Enhanced Stability: Includes 12 interlocking leveling blocks measuring 8.5 in × 8.5 in × 1.3 in to build a secure base. Non-slip texture and solid bottom help reduce sinking on gravel, dirt, grass, and uneven campsites while improving rv stabilizer performance Portable Storage for Every Adventure: Comes with a carry bag for organized storage and easy transport between campsites. Lightweight and compact design makes these stackable camper leveling blocks easy to pack with your rv camping gear Must-Have RV Camping Essential: Easy to set up, easy to store, and built for dependable leveling wherever the road leads. A practical addition to your camper essentials and rv accessories collection, helping create a more comfortable and stable camping experience Free shipping included. 30-day hassle-free returns.