From Nuby
The suction base sticks to most table surfaces. Ensure the surface is flat, smooth, clean, and dry. Press the bowl firmly down onto the surface to activate suction. Gently tug on the bowl to check that it's securely attached. Avoid using on porous, uneven, or textured surfaces. To release the suction, lift the small tab located on the edge of the suction base. Avoid pulling the bowl directly upward, as this could cause contents to spill. Bowls are stackable. Do not press down when stacking, as strong suction may occur and make separation difficult.