Customize the numbers on your high-security Cluster Box Units with our convenient number decals. These decals make it possible to match apartment or house numbers to corresponding CBU mailboxes. Custom decals are also available, please call for more details. Each decal holds up to 3 digits standard. Suitable for outdoor use, these decals feature black text on a silver background and measure 1-3/4"W x 1-1/2"H. Ships UPS or USPS.