Each impact-resistant 2 ml tube contains garnet matrix and one ¼ inch ceramic sphere. Extra ¼" ceramic spheres are packaged separately. Lysing Matrix A tubes have orange caps and are found in the FastDNA™ and FastDNA™ SPIN Kits. Lysing Matrix A is used for all sample types except soil for the subsequent isolation of genomic DNA, RNA, functional proteins and other metabolites and small molecules. This grinding matrix is chemically inert and will not bind nucleic acids.