This Quick Chill microcentrifuge tube unit rapidly and repeatedly chills biological samples to -20?C for use in molecular biology applications such as ethanol precipitation of DNA/RNA samples. It can be used repeatedly for up to 45 minutes eliminating the inconvenience of dry ice/alcohol baths. Made of durable polycarbonate and pre-filled with a non-toxic insulating solution. Set includes 16 tube inserts and holds twelve 0.2 to 1.5mL microcentrifuge tubes in a 3 x 4 array. There is no direct contact between the tubes and the insulating solution so labels and markings won't come off. The unit offers a break-resistant stackable design with a convenient carrying handle and rubber feet that keep the unit from sliding on the bench surface. Material: polycarbonate with a non-toxic insulating solution. Number of inserts: 16. Capacity: 12 tubes. Tube size: 0.2 to 1.5mL. Array: 3 x 4. Dimensions (L x W x H): 151 x 108 x 125mm (5-5/16 x 4-1/4 x 4-15/16 inches). Weight: 1-1/2 lbs (0.68kg). Sold individually. Nalgene #: DS5114-0012.