Microfine Glass Granules - 500g bag Microfine Recycled Glass Granules Only (0.1 - 0.35mm) in size. £1.85 Microfine Recycled Glass Granules Only (0.1 - 0.35mm) in size. Extremely tiny granules and beautifully free flowing. Minimises the 'crunching' in reborn limbs from coarser glass granules. The slightly darker colour is from using different coloured glass, it is nearer in colour to the reborn baby limbs than the white granules made from clear glass only. It is NOT sand!