Customer service advocates at Tisch Scientific are always ready and available to assist you with your purchase of Microtube Racks. We make it a goal to meet and exceed customer expectations. The Biologix 80 Well Polypropylene Assorted Color Microtube Racks are for use with 1.5ml or 2.0ml microtubes. They have molded numeric grid for identification purposes, and are available in a variety of color options (red, blue, purple, green and yellow). This item is priced by case (20 racks).