Hollow-core honeycomb technology makes the Hudson Easy Mount Floating Shelves - 3 pk. (2 x 12 in./1 x 24 in.) - White extremely lightweight. Each shelf is made of 70% recycled cardboard materials arrayed in a honeycomb structure that's extremely strong and rigid. A scratch-resistant white melamine finish stays gorgeous over time and complements most any style. The internal mounting system involves a bracket with support tubes that you'll affix to your wall with included screws. The back of each shelf has ports that slide onto the support tubes for a secure fit that never sags away from the wall. This unique mounting system offers superior strength and mounting ease.