Each impact-resistant 2 mL tube contains 1.4 mm ceramic spheres. Lysing Matrix D tubes have green caps and are found in the FastDNA Spin Kit for Plant and Animal Tissues and FastRNA™ Pro Green Kit for isolation of nucleic acids from plants and animals. Lysing Matrix D is used primarily for lysis of softer tissues like brain, liver, kidney, lung, and spleen. This grinding matrix is chemically inert and will not bind nucleic acids.