28mm closures mate directly with glass containers featuring a standard 28/400 GPI threaded neck finish. These caps fit wide-body glass pre-roll tubes as well as specialized glass concentrate containers, including the Grand Puff 5ml Glass Concentrate Jar.

To verify neck finish specifications and closure dimensions prior to setting up capping equipment, check technical specification tables inside each product listing.

• Induction Foil Liners: Hermetic thermal seal barrier designed to stop volatile terpene loss and prevent liquid extract leaks.
• Smooth Sided Finish: Available in black and white high-impact plastic profiles suited for automatic top-labeling equipment.

Induction foil liners fuse directly to the lip of glass containers using electromagnetic heat sealing machinery. Passing capped jars under an induction sealer melts the foil coating, creating an airtight tamper-evident seal that protects extracts against oxidation.

For custom label application or specialty packaging services, explore options in our Custom Branding Services Menu.

Yes, 28/400 closures feature push-and-turn safety mechanics that fulfill statutory state dispensary compliance rules. Dual-motion locking mechanisms require simultaneous downward torque and counter-clockwise rotation to remove caps from container rims.

Review state-specific retail packaging regulations using our State Compliance Regulations Guide.

Inventory ships directly from our Sacramento warehouse so clients can access single units, standard split packs, or master wholesale cases without minimum constraints. Local warehouse stocking eliminates overseas factory lead times and keeps commercial filling lines operating without delay.