The Army Painter Mixing Balls are a set of 100 5.5 mm stainless steel balls that are perfect for use as paint agitators.Heavy pigment, old paint or a combination thereof: the Mixing Balls will make your paints perfect again. The 5.5 mm stainless steel high-grade Mixing Balls will blend medium and pigment perfectly together, with a few shakes of your paint bottle. Brand: Army PainterModel: TL5041