Crafted from Natural Rubber, 100% Non-Toxic Operates in Tandem with Original MCRS Magnets Adheres to Steel Surfaces The Original Magnetic Ball since 2010 Suitable for all dogs, this magnetic ball is crafted from 100% non-toxic natural rubber. It functions optimally when paired with the original MCRS magnets and can be stuck to steel surfaces. The Original Magnetball, introduced in 2010.