stainless steel and genenral steel various colors and sizes fast delivery be sewed by thread and pin on the edge of weft hair/hair weaving1) Size: 2.2cm, 2.8cm, 3.2cm, 3.8cm2) Type: U type ang T type3) Color: black, dark-brown, light-brown, beige, white3) Materal: Korea stainless steel and general steel clips/extension clip/clip for human hair extension