High quality crimp top vials with crimp seal- Aijiren Crimp Vials. 20mm crimp top septa is used PTFE and high-quality silicone rubber or ultra-pure silica as raw materials, the gasket is guaranteed to be non-toxic. 1. Bevelled top design. 2. Available with amber or clear vial. 3. Available with 20ml or 10ml vial. 4.