Limited Volume Snap Ring™ Crimp Top 12 x 32 Vials. Outside Vials are a combination of Type I low extractable borosilicate glass inserts and clear or amber thermoplastic polymer outer vial shells. Only the glass contacts the sample and the seal. Item No. 302511CP-12 The new Finneran 4-Fin Polypropylene 11mm Crimp/Snap Ring™ vial .