The wood cap system and the inside wall supports add to the unparalleled structural integrity of the feeder. Sealed feeding tubes ensure the bees are confined to the feeding area so you will experience minimal drowning. This is the only feeder available where the entire cap and ladder system is easily removed for cleaning. Sealed feeding tubes prevent the bees from making burr comb in the feeder and keep the queen from laying brood inside. Textured interior walls for those who wish to use the feeder without the cap and ladder system. We've completely redesigned the ladder using better material and adding a lip at the top and a flat bottom to hold it in place better.Made in the USA!