These large block magnets are coated with a layer of black rubber that is similar to tire rubber. This coating makes these magnets very water resistant and virtually indestructible. They can be slammed together without damaging the magnets.
These blocks are incredibly powerful. Two of them stuck together are very difficult
to separate. These rubber-coated blocks are great for holding through glass and other materials. The rubber coating helps to prevent the magnets from sliding on various surfaces, as we describe in our Leverage & Friction
Also available in this size: BY0X08DCS
(Grade N42, Nickel Plated, Countersunk), BY0X08-N52
(Grade N52, Nickel Plated), BY0X08DCSPC-BLK
(Grade N42, Double Countersunk, Black plastic coated) and BY0X08
(Grade N42, Nickel Plated)