How about electromagnetic suction cups from Magnetics

The performance of the electromagnetic suction cup of the magnetic is very excellent, it has good stability, durability, low resistance, stable magnetic field, can effectively reduce the cost of using the suction cup, improve the use of efficiency, long service life, flexibility, can work in a variety of temperatures, and is not easy to aging, high reliability, security, cost-effective, excellent physical properties, wide range of applications, energy saving and environmental protection, reliable quality, and can meet the requirements of different users.