Understanding that it's the details that make the difference between good design and exceptional design Road Ready created their Keyboard Series. This collection features their exclusive Z-Lock Foam System that allows you to customize the inner length, width and height of your Road Ready case to accommodate virtually any model of Roland, Yamaha, Korg, EM-U and other 61 key keyboards. Simply lock or un-lock the layers of Z-lock foam to create your perfect custom fit. And for sleek, stealth mobility they're equipped each case with the unique low-profile wheels. Upgrade your keyboard not your case.