Using these Behringer rack ears is simple. First, make sure your 70 HP Eurorack chassis is clean and ready. Then, attach the rack ears to the chassis. After that, you can easily place your Behringer synthesizers or other 3U format equipment in the chassis. When handling the rack ears, be gentle to avoid any damage. To keep them in good condition, clean them regularly with a soft, dry cloth. Don't use harsh chemicals as they might damage the finish. If you have any problems during installation or use, refer to the product manual or contact Behringer's customer support.