These blocks are strong plastic and they hold your VR weight very well.This is my second set and I have been using them for years !

Bought this with the Tri-Lynx Levelers 10 pack. https://www.amazon.ca/gp/product/B0028PJ10K/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1They work like lego blocks and are great for any leveling needs. The LynxCap provides a nice even surface to put the trailer stabilizers or Front leveler on. So far so good. Even used it to level out the picnic table at the site.

For the Seller, we went camping and discovered that night we needed more leveling helpers. Went on amazon the next day, found these, left camp the next day and was met at home with the package! Perfect as we are outbound again in 6 days. But WOW! Perfect, excellent service. Havent actually used them but know what we need them for. Thanks for the expedited delivery and for our next adventure

Ordered these to replace a set I bought years ago that had finally started to fade, warp and crack. They outlasted 3 campers and were on #4 so I figured I got my money's worth! We use them year round whether the camper is being used or in storage. These toppers work great with the basic blocks -- they fit on top of the orange blocks and since the round center parts sit up inside there is no sliding or shifting with them. This is important as more than once through the years I've seen people using homemade blocks or wooden chunks which slipped off and resulted in the jack sinking itself in the ground and needing picked up & out by a tractor. These when used alone they are about an inch, used with the blocks they give you about half an inch so they give that perfect leveling if you're just slightly off. We use them for anything we need to contact the ground -- under the tires as well as the jack and the levelers. Well made, sturdy, stand up to use!

Delivered quickly. They look firm enough for the job.