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Flot is designed for the blind to easily pour water into cups. It hangs at the edge of the cup, with two small balls fell on each side. When water comes into the cup, the ball inside floats up, making the other ball outside go down. The blind stop pouring water as soon as they touch the outside down-going ball. The U-shaped clip at the edge of the cup is made of rubber, balls made of plastics, and rope made of glass fibre. Flot is suitable for all kinds of cups.