The choice of material depends strictly on the intended application. For hair styling and heat tool training, you must select heads with 100% human hair or high-temperature resistant synthetic fiber. For display purposes (hats, jewelry, or wigs), PVC or PE materials are preferred due to their durability and lightweight nature. If the head is for makeup practice, ensure the surface is made of soft silicone which mimics human skin texture and allows for easy pigment removal with makeup remover or oil.