Jbp Nano Cannula 21G 50mm UTW (24 needles)A new generation of cannulas are designed to reduce the damage of hypodermal tissues. Advantage of JBP NanoCannula Treatment: Less downtime and less internal bleeding Also features the following for minimal pain 1. Thin walled cannula with wide inner diameter helps inject with less resistance. 2. The cutting edge of cannula hole is micro polished with special technology. 3. Each Punching needle is designed for less pain and damage to skin tissues.