BD microfine plus 32g x 4mm pen needles of 100 are designed to the needs and preferences of patients with diabetes. The Disposable Needle BD Ultra-Fine plus 4 mm uses the technology to make it easier to inject insulin. Characteristics: 1. BD Micro-Fine plus Diabetic Insulin Pen Needles Lower the Risk of Intramuscular Injection 2. This 4mm insulin pen needle Helps to Lower the Hypoglycemia Related Issues. 3. BD 4mm Micro Fine Pen Needles Comes with Advanced Injection Technique 4. Insulin Pen Needles 4mm Can Lower Anxiety during Insulin Injection 5. It is compatible with most brands.