Each impact-resistant 2 ml tube contains 1,4 mm ceramic spheres, 0,1 mm silica spheres, and one 4 mm glass bead. Lysing Matrix E tubes have purple caps and found in the FastDNA™ SPIN Kit for Soil and the FastRNA™ Pro Soil Kits. Lysing Matrix E can also be effective in lysing mixed samples, such as microbe infected tissue, and can be used in RNA extraction from tumours and other difficult tissues.