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1. Glass Cartridge, also known as borosilicate glass barrels for pen-injectors.
2. The normal sizes are 1.5ml,1.8ml, 3ml and 4ml. Other sizes can be also customized.
3. The colour of cartridge is clear, material is 5.0 neutral borosilicate glass, and its water resistance is type1.
4. We can provide aluminum cap, gasket, piston and other supporting products.