Plastic, transparent 5 mL vials with crew caps and writing patch. Used for Microsampling Wing plasma preparation by centrifugation, wing storage, and sample shipment. (14 pieces/pack.) Polypropylene tubes with polyethylene caps. Dimensions are 16 x 60.2mm. Use with Microsampling Wing 228-77120-41. Requires a centrifuge with a swing bucket rotor capable of 2000g or higher.