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Getting level at a campsite rarely takes a nice round number of inches, which is why these blocks interlock and stack - each one in the 4-pack adds about 1 inch of height, so you can dial in exactly the lift you need instead of guessing with wood scraps.
They're molded from UV-stabilized resin with a solid bottom that resists sinking into soft ground, and the bright yellow color makes them easy to spot so you don't accidentally leave one behind at the campsite.
Hose them off after use and they pack flat into the included bag for easy storage in a basement compartment.