Arm injection model Features: 1.Simulatinginjection,bloodtransfusion,hemospasiaofthearm . 2.Thereisaobviousfeelingwhenneedlepenetratesintotheveins. Bloodflashbackindicatesproperinsertion. 3.Veinsandskinscanbeacupuncturedrepeatedly,andtheseoperationswon'tcauseleaks. 4.Veinandskincanbereadilyreplacedwhendamaged. 5.It'sconvenientandeconomic .