This is a brand new 1000 piece Black Flip Off seals that fit 20mm serum vials + 1000 gray Butyl Stoppers they both will fit a 20mm tops vials (Sold Separately). These come in a plastic bag as shown in the picture. Manufacturer is unknown. Buy with confidence, check our feedback. We ship Priority US Mail with tracking.
** Please note Gray Butyl stoppers are not sterile**
No Vials are included with these. We sell the 10ml 15ml and 20ml vials the caps will fit in a separate listing.