Novolin Flexpen R is a short-acting insulin. It is an insulin delivery device designed for managing diabetes, Features: -Pre-filled insulin pen that provides a convenient way to administer doses of insulin. -The pen can dial doses up to 60 units in increments of 1 unit. -Do not mix with any other insulin. NOTE: We recommend that all insulin products should be shipped Next Business Day. Free shipping on orders over $100 is for Standard shipping only.