Mixing balls are the perfect way to keep your paints in great condition. Simply add one of these to any pot of paint and shake.The action mixes the pigment back in to provide an even coverage.These enhance any paint but are esepcially useful when using iridescent or colour changing paints, thicker paints or washes.Each ball is 5.5mm in diameter and made of hardened chrome steel.A pack contains 50x mixing balls.