Lip plates are usually made of clay or wood and range between 4 and 25 centimeters. To be placed on the lip, two or four teeth are removed before the lower lip is cut to fit the lip plate. This lip plate process is usually done by their mother when they attain puberty. To stretch the lip, a ceramic disc is placed after the cut and will remain until the initial cut has healed before it is placed with another slightly larger disc. The process is repeated so that the lip will become large enough to accommodate the first lip plate which is about 4 centimeters.
Read more at the following link: https://guardian.ng/life/the-ethiopian-tribe-where-a-lip-plate-makes-you-more-attractive