Product Name. WISP 48 Snap Seal Vial. Products Often Purchased with 4.0 mL, 13 mm WISP 48 Crimp-Top Step Vials with Grad Marking Spot, Clear, 100-pk. 4.0 mL Wisp 48 Aluminum Crimp-Top Seals and PTFE/Silicone Septa, 100-pk. 4.0 mL Wisp 48 Aluminum Crimp-Top Seals and PTFE/Butyl Rubber Septa, 100-pk. 24659. 15 x 45 mm. 13 mm Crimp-Top.