The Messermeister Next Level Magnetic Knife Block can hold up to 16 knives, and can accommodate blade lengths up to 10.5 inches. Place your knives on the four acacia wood panels with magnetic pads. The angled panels are open to allow for air flow, which helps reduce the growth of bacteria. Ultraviolet LED lights illuminate the inside of the block for five minutes. Three AAA batteries are required (not included).