The RKS30X is the best keyboard stand on the market. First off this uses a push-button mechanism to adjust the height up and down. With the RKS30X You will not have to sit there turning a knob like with conventional X stands. With this one you hit a button and you can adjust the height of the stand quickly and easily. This mechanism is actually also way more sturdy than the older technology. Most X stands have square-shaped tubes. The Rockville RKS30X has circular tubes. Our engineers found that circular tubes are more sturdy and are stronger and more durable. These can withstand a ton of impact. The weight capacity of this model is 132 pounds. This is a conservative rating. We rate this at 132 pounds capacity although it can really handle more than this. The tubing is 1 MM thick. We added thumbs on the top of the stand where your keyboard sits to ensure your keyboard is snug and can not fall on the floor accidentally. The rubber feet on these have ridges so that even if the floor is not level the stand will sit sturdily. and also will stop the stand from sliding on slippery floors.