AB-Lock nipples are coated with special designed epoxy micro-encapsulated curing adhesives, that enhance the anchorage of threaded fasteners. The pre-applied adhesives remain dormant until the shearing action of engaging the spoke into a nipple or threaded cavity breaks the capsules and allows the adhesive to cure.
Epoxy coating is specifically designed on the upper square, and experiments have proved that it can effectively reduce the probability of spokes thread breaking. This kind of epoxy will be completely cured after the first use, and even if it is for the second time, it still retains part of its anti-loose ability.