Mirka 56-332-220 - Hiolit 5" PSA Cloth Disc 220 Grit (Qty 50/bx) Hiolit J is a flexible sanding material for metal and wood workshops. Compared to standard weight cloth products, Hiolit J is more aggressive, while still remaining very flexible. Hiolit J is a durable product with super edge wear, making it very suitable for tougher and more aggressive sanding of profiles and seams.