This suture material is usually prepared in the plainted or braided form and consists of filaments prepared by polymerizing the ester formed by a combination of ethylene glycol and terephthalic acid. In its commercial form it is known under the trademarks Terylene (I.C.I.) and Dacron (Dupont). The number of filaments in the braid determines the size of the completed strand. The polymer has a softening temperature of not less than 255 degree and may be sterilized by autoclaving, ethylene oxide or radiation treatments, in order to improve its visibility in tissue it is often dyed or pigmented with non-toxic materials.