Four-Vein Venipuncture Training Aid - Latex Free Dermalike Ii™ And Dermalike V™Venipuncture Training Aid has four barely discernable blue veins in three different sizes with a fourth vein more deeply placed in our proprietary Dermalike II semi transparent flesh colored material. Your patients dont have one size of veins, so why practice and learn on a one size vein fits all IV arm? Many clinicians have commented when using various other IV training models, I wish all our patients had veins this big. This model permits clinicians