12 Pieces cartridges for A7 Nano Round bayonet slot. Each cartridge is individually sealed and sterile. DO NOT reuse cartridges as they are meant for one time use ONLY. These replacement cartridges are specially designed for Dr. Pen Ultima A7, they are not compatible with other models, such as A1,N2, M5, M7, A6, A7, X5, or any other brands.        
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