These one-piece combination frame/foundation are made in the USA by Pierco from FDA approved, food-grade plastic resin. The frames have a patented ear design that is engineered and tested to withstand heat deflection, impact and stress. The frames are coated with US beeswax and are backed by Pierco’s 10-year guarantee. The black color helps you see eggs in the cells. Simplify your beekeeping with Pierco one-piece frames. No assembly required. Frames are double waxed. Pack of 10.