*REQUIRES SHIPPING FEE–CONTACT TO ORDER The Z-Ears are standard 3U rack ears. These parts are made of anodized aluminum and are custom made to work with Eurorack mounting rails like Z-Rails. The Z-Ears are sold as a pair and do not include the Z-Rails shown in the photo. You will also need (4) M4 x M10 screws to attach Z-Ears to Z-Rails (Not Included) -Rackmount Version- Designed to fit in standard studio racks. -Tabletop Version- Designed to fit in standard studio racks OR rest on desktop.