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Glass Material — Crafted from glass with durable butyl rubber stopper and tight aluminum crimp sealing. The high-purity glass features excellent chemical stability, low dissolution, strong pressure resistance and leakproof performance, effectively protecting liquid ingredients from contamination, oxidation and leakage during storage and operation. Independent Packaging & Standard Quantity — Each glass is individually vacuum-sealed in a clean independent package to ensure full sterility and zero pollution before use. Uniform production specifications guarantee quality for single vial, providing clean, safe and disposable replacement consumables for long-term use. Multi-Scenario Professional Application Range — Widely applicable for scientific laboratory research, peptide solution preparation, reagent dilution and liquid sample storage. Perfect for cosmetic formula testing, beauty ingredient blending, experimental liquid configuration, academic teaching demonstrations, equipment operation training, scientific project testing and daily laboratory sample arrangement. Suitable for personal research use, institutional experimental work and technical training scenarios with diverse liquid preparation demands. Precise 3ML Standard Dimension & Capacity — Adopts industry-standard 3ml specification with precise internal capacity and unified outer caliber size. Strictly calibrated dimension ensures smooth installation, accurate liquid filling and stable dispensing control. The transparent tube body allows real-time observation of liquid capacity, making volume judgment and liquid management more intuitive and accurate. Full Generation System Compatibility —Compatible with V1, V2 and V3 mainstream injection pen systems. Standard interface structure supports seamless assembly and normal use for all three device generations, offering universal interchangeability and strong adaptability for different versions of cartridge injection pens.