Venipuncture Training Aid Four-Vein ModelThis unique training aid permits the realistic practice of starting an IV as well as being an excellent model to practice the mechanics of "no stick" IV catheters. Model displays blue veins which are barely discernible through the semi transparent, tissue like material. When accessing, the skin rolls as you palpate the vein and a "pop" is felt as the needle enters the vein. This model has three veins of different diameters and a fourth vein deeply