The new BD Ultra-Fine TM PRO 4mm Pen Needle is designed to balance different injection forces for a more reliable targeted injection depth .Even the best pen needle from BD could be improved! The new BD Ultra-Fine TM PRO 4mm pen needle helps people with diabetes to better manage their therapy with more reliable subcutaneous insulin delivery. 1 This is the result of recent research by BD - the insulin injection expert since 1924.
https://www.politico.com/blogs/ben-smith/2010/01/drafting-kudlow-024416