About the Eva Training Head, Medium Brown Our Eva training head stands out with its 40 cm long, high-quality Indian human hair. Eva has a higher density of hair and, with its 50 cm head measurement, is ideal for a wide range of applications. Its 135 g of human hair allows for a variety of cutting, coloring, and balayage techniques. Thanks to its natural fall, the training head is also ideal for slicked-back hairstyles and layers. Indian hair has a round to slightly oval diameter and is approximately 0.08–0.12 mm thick, slightly thicker than European hair. Indian human hair is particularly prized for its natural shine.