Bd Ultra Fine Pen Needle 4Mm Is Designed For Use With Compatible Medication Delivery Pens, Offering A Compact Needle Format For Users Who Require Pen-Based Administration. Its 4Mm Length Provides A Short Needle Option That Can Be Convenient For Routine Use When Appropriate For The User'S Prescribed Pen And Administration Technique. The Needle Is Designed For Compatibility With Suitable Pen Devices, Making It Important To Check Device Compatibility Before Use. Its Compact Format Is Also Practical For Carrying With A Medication Kit Or Keeping A Supply Organized At Home. For Safe Handling, Each Needle Should Be Used According To The Manufacturer'S Instructions And Relevant Healthcare Guidance.