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[V1‑V2 Device Compatibility] Our reusable 3ml pen cartridge is precisely engineered for full compatibility with V1 and V2 devices – ensuring a secure and reliable connection with every use. [Sturdy Glass Protection] This 3ml peptide pen features a robust glass construction that provides an inert environment for your solution – preserving the stability and integrity of its contents throughout use. [Precise Volume Control] The 3ml pen cartridge bottle is equipped with an 11mm long stopper for accurate capacity management – delivering consistent and dependable dosing every time. [Individually Sealed Packaging] Each reusable 3ml peptide pen cartridge is individually sealed. This guarantees that each cartridge is ready for immediate use. [Convenient 20‑Pack Set] Our 3ml pen cartridge bottle come in a practical 20‑pack for easy storage and management – portable enough to keep in your pocket, so you always have one on hand when needed.