The Z45W by Rockville is a 2-tier portable Z-style keyboard stand with lockable wheels that includes a travel bag. This stand is way sturdier than an X stand. It has an adjustable width allowing you to optimize it for any keyboard 49 keys and up. It is perfect for playing while sitting or standing since the height is adjustable. The second tier is built like a tank. We use metal joints with hand tightening screws to adjust the angle. The metal joints have a teeth-locking mechanism so they will always be secure and tight. The lockable wheels make this super easy to move around. Set-up and break-down is quick and easy. Simply remove 2 hand screws and take off the middle crossbar and put it flat into the included bag! There is also a headphone hook to hang your headphones as well as anchoring straps to secure your keyboard in place. Our model is significantly sturdier than most others on the market. Rockville has been producing some of the highest quality stands and bags on the market for many years.