Factory Direct Sales Hot Selling Adjustable Dose Disposable Dual Chamber Insulin Injection Pen 50iu Intuitive and proven twist motion dose dialling and push-button activation for maximum patient acceptance Bayonet connection and sliding for quick cartridge change High quality look & feel Product Features Disposable use Minimum Single dose 0.01ml; Injection of high precision, the error is less than 5%; Compitable 4ml dual-chamber (2ml+2ml) cartridge. Actuator own patented