Sealey Walnut Shell Blast Media Size 16/30 12.5kg Tub WS12.5KGA widely used and cost effective media created from ground walnut shells. Non toxic, environmentally safe and biodegradable. Size 16 30. Suitable for blasting and cleaning in a wide variety of environments. Ideal for cleaning wood, metal, fibreglass and stonework. A good alternative to soda media particularly where high dust levels are not acceptable. WALNUT SHELLS A widely used and cost effective media created from ground walnut shells. ORGANIC Non