ClosetMaid's Impressions White Shelves are an easy way to increase the storage potential of Impressions Closet Towers and Base Organizers. The additional shelves allow you to customize your Impressions units to meet your specific needs for a more customized approach to storage. Each set comes with 2 white shelves compatible with either the 16-inch Impressions Closet Tower and Base Organizers or the 25-inch Impressions Closet Tower and Base Organizers (when the correct option is selected). Installation of each shelf is as easy as inserting 4 shelf pins and tilting the shelf into place.