There are 2 types according to the type of fabric they're made, Angola and Aba 20mm. They come in many sizes and colors.
Angola type we have 6 sizes 12" 18" 22" 30" 40" 50"(inch) and 7 colors, brown, blue, chocolate, cream, grey, honey and pink.
Aba type we have 22" 30" 40" 55" (inch) and 6 colors brown, cream, honey, pink, blue and red.