I want first to clarify a confusing point. For some reason, the description of this product says, "The sturdy plastic risers have the look of wood and add an additional four inches of height to your bed," while in the specifications the material is listed as wood. I took a chance and purchased them hoping that they would be wood and not wood-look plastic, and they are, in fact, solid wood.
These risers meet my needs perfectly, and at half the price of a similar item I found elsewhere. It should be noted that the quality of wood is not incredibly high - the edges on some are a bit chipped and splintered, but at least chipped prior to finishing, so the finish coat is uniform. But these are a utilitarian product which won't usually be scrutinized at close range. My bed skirts cover the tops, which is the location of most of the chipping, and I like that the bottom part which can be seen looks like a normal leg of a bed. I highly recommend these, flaws and all.
I love it. Ordered two boxes thanks to one of the reviews that reminded me about the extras needed for a queen. I may just order another set to make it a bit higher for more room. Very durable and easy to put underneath the frame. Although the little pieces of wood that are added for decor come off very easily just get some wood glue if you're into that kind of thing.