By far our favorite new springtail for isopod bins. These are a smaller species, about half the size of temperate isopods. They reproduce well, and they are not crazy running around all of the isopods like the tropicals most people use. Upon magnification they are gold colored. You will not regret adding some 24K to your isopod bin or vivarium. This is an 8oz. culture on coco fiber with over 100 springtails. Very limited quantities available.