The RingSeal Cryogenic Vials 5.0ml by Globe Scientific are a sterile and reliable option for various medical and laboratory uses. Made of durable polypropylene material, these vials have a screw cap design to ensure secure closure. With a stable temperature range of -196°C to 121°C, they are suitable for emergency medicine, dermatology, cardiology, and more. The bag of 50 vials is ideal for storing and preserving biological samples in a sterile environment.