Mag-Clip Magnetic Suction Cups When you need industrial strength magnetic suction for your aquarium, look no further than for Zoo-Med's Mag Clip Suction Cups. Versatile and affordable, this cup brings powerful suction cup power at a value cost. This set features interchangeable clips and a set of magnetic cups for myriad combinations while you choose a tank setup. It's like getting several suction cup sizes for the price of one. Each package contains a cup set and six clips in different sizes. Ideal for holding equipment and accessories like heaters, airline tubing and spray bars, etc. Cup is magnetic on both sides.