A majority of type 2 diabetics currently use Lantus SoloSTAR Pen. Most of them use prefilled injection pens that are entirely disposable. These pens are more convenient to use for most patients with busy lifestyles, as they come pre-filled with insulin/medication. Easy push-button injection, transparent cartridge, and a window showing injection is complete are the features desired by all current injection pen users. The top three features for which most patients are likely to switch to another brand (if their current pen does not have those features) are easy push-buttons, pen memory, and highly automated.