I only needed an inch to fit some plastic containers under the bed. These blocks are sturdy and worked perfectly. They don't slip at all. There's 2 pieces, so if you want to raise it higher, you use both. I'd rather not have blocks under the bed, but if you need something solid that doesn't look too awful, these will work.They arrived and are broken.The plastic these are made from is pretty hard so they are a bit slick where the furniture meets the riser. They are supposed to include silicone discs but the kit I got included only 1 disc. The disc is small in relation to the riser. The inside diameter of the riser is 3" x 3" while the disc is 2-2/8" round. A better solution would be a 3"x3" silicone or rubber square insert. Also, the rim is only on two sides of the riser so the furniture leg could slip off. I'd be leery about using these on anything that would be subject to horizontal movement, e.g. a recliner or washer as it could possibly slip off the riser.Overall, these work but I think there are better solutions available.Compared to the pyramid-ish shaped risers I’ve tried, the tiny spikes on these help hold on to the furniture leg better, significantly decreasing the amount they slide. That plus the geometry/design make these feel relatively more stable.Blocks feel sturdy, while not being fully solid (pic of undersides). Using it to raise a sofa fine.The silicone pads are sticky on both sides. It doesn’t seem to be an adhesive glue, but just a really sticky soft silicone, like some car phone mounts. Probably a bit too sticky to use between the risers and the floor unless you REALLY don’t want it to slide. Seems to work well between the riser and furniture leg.My couch was just a half-inch too low to the ground for my robot vac to successfully navigate. It was high enough for it to get under, but low enough that certain spots on the underside would snag it up.I didn't need a whole lot of extra space, so it is nice that these risers come in multiple sections. I was able to take out the larger section of each riser and just use the smaller piece and the rubberized footer for each of my couch legs. They are very sturdy, and even my extra-heavy couch is secure on these.No more robot mishaps under the couch, and the change in height is barely noticeable when sitting on it, which I like.My daughter's dorm offered no outlets for her mini fridge outside of placing it under her raised bed. The issue was, the bed wasnt.high enough to allow her to open the freezer. I ordered these bed raisers.and they worked perfectly and have remained stable for the last month.This set works well for the purpose I am using them for. I needed to give my patio furniture some extra height as it sits too low to the ground. This set is a good value for the amount received, durability, sturdiness, stability, stackable, functionality and price.These risers are 3.2inch high but it increases the furniture height close to 3inch. It has spikes on its surface which helps to keep the furniture especially the wooden ones on it stay properly. It won’t slip. This has a surface area which fits most furnitures. I used this for my bed. The silicone stickers that comes with it is not required since the riser itself has a shock absorbing bottom. Good value for money.