Our fabric mobile arm cover comes in many on trend nursery colors including blue, aqua, pink, white, gray, green and cocoa. There is one to go with most any DIY baby crib mobile projects and nursery decor. Fabric sheath will completely cover the mobile armature, making it an attractive part of your nursery decor. Fabric cover simply slides over the armature. Cover measures 39.5 inches and is designed to be used with 30 inch mobile arms. Quality fabric. Includes fabric cover only, not the mobile arm / armature.