These factory sealed Kimble Chase Disposable 15mL Centrifuge tubes, cat. no. 73790-15, are made from borosilicate glass in compliance with ASTM Specification E438, Type I, Class A or B glass requirements. Tubes come with conical shaped bottoms to withstand centrifugation up to 2980 RCF. They have a finished top for a snap-cap closure. Tubes are plastic shrink-wrapped to keep them clean and safe in transit. Snap-cap closures are not supplied.Condition: Excellent; factory sealed. Sold as is without warranty expressed or implied. Buyer is responsible for determining the suitability of this product for their application.Quantity Available 10 shrink-wrapped packs (5 packs are in original factory case). Inventory changes regularly, so please inquire about availability.