This polyvinyl choride heat-shrink band is made for use with Nalgene® Sterile PETG Square Media Bottles providing a tamper-resistant seal to ensure the integrity of the bottle contents. Simply apply the recommended application torque for the closure and slide the heat-shrink band over the closure and bottle neck; heat the band to shrink and secure contents. The band is gamma stable and includes a perforated tear strip feature for easy removal. This item is packed 1,000 per case (two zipper bags of 500 each). Material: polyvinyl choride. Size: fits 2000mL PETG bottle with 53B HDPE closure. Torque wrench fittings: 2195-1154. Application torque: 38-53 in-lb. 1000/Case. Nalgene® #: 312160-0530.