BD Micro-Fine Plus pen needles are precision-engineered insulin pen needles with a 6mm length and 31G (0.25mm) thickness. Each box contains 100 sterile needles designed for comfortable and accurate insulin delivery. The product features a universal screw system that makes it compatible with most insulin delivery pens. The 6mm needle length is suitable for subcutaneous insulin injection. Each needle is single-use only and comes individually packaged to maintain sterility.