ERTEK ASTEROIDS is produced from hard shells of fruit stones that have been stabilized by drying and degreasing. Ligneous residues and foreign matters like mineral or metallic particles are eliminated. ASTEROIDS is the result of many years of practical experience in blending the raw material to achieve a highly homogeneous and efficient product. No chemicals are used in production process. Raw materials are only treated mechanically. Hence the use of ASTEROIDS is perfectly safe and harmless. ASTEROIDS is produced with particle size tolerance of Ø 1,3 to Ø 1,7 mm.