Oxygen Barrier Beer Bottle Caps (144 pack - Cold Activated)

Crowns start to change to blue at 46.4 degrees & at 41 degrees they are at their maximum blue tonality indication. Intermediate size Pry off crowns corks 26mm. Excellent reliability & compatibility with the glass ends. Liner : Dry Blend ( PVC Free ). Oxygen Scavenger. Oxygen Barrier. Steel type: TFS & ETP.