A high density, high impact, high strength microsphere used as a thickener for thixotropic mixes such as adhesives and castings. Especially useful when making up acrylic resinches such as Paraloid B72 and B48N to bulk out worm holes or for china fills etc. These special balls are also great for holding delicate objects undergoing repair or reconstruction (i.e. ceramics and porcelain). Available in three sizes - 1 for 1.00mm to 1.25mm - for filling voids, particularly woodworm holes etc; 2 for 2.00mm size balls for larger fills and securing ceramic and glass items during repair; 3 for 0.43g - fine 0.43g powder, for bulking out acrylic and epoxy fills.