Link multiple racks together for a custom rack solution Autoclavable polypropylene (PP) Heavy-duty construction is durable and chemical resistant Multiple colors available for benchtop organization at a glance Numeric markings for sample identification Versatile design accommodates different tube sizes on each side The four sides hold the following tubes: ​Four (4) - 50mL Tubes Twelve (12) - 15mL Tubes Thirty Two (32) - 1.5mL Tubes Thirty Two (32) - 0.5mL Tubes  *Note - Assorted Pack Colors: Blue, Green, Orange, Pink, Yellow