Features
1.Simulating injection, blood transfusion, hemospasia of the arm
2. the deltoid muscle injection
3. There is obvious feeling when needle penstrates into the veins.
4.Blood flashback indicates proper insertion.
5.Veins and skin can be acupunctured repeatedly, and these operations won't cause leaks.
6.with changeable vein and skin 

Features
1.Simulating injection, blood transfusion, hemospasia of the arm
2. the deltoid muscle injection
3. There is obvious feeling when needle penstrates into the veins.
4.Blood flashback indicates proper insertion.
5..Veins and skin can be acupunctured repeatedly, and these operations won't cause leaks.