PROGUT Catgut Sutures - Plain and Chromic Virtues Most widely used in the surgery. Good tensile strength. Excellent handling property & easy to knot, even in depth. Twisted multi-filament with virtually monofilament finish. Material Catgut, a natural absorbable suture is obtained by longitudinally slitting the intestinal submucosa of sheep and goat. twisting the ribbons and joining them in wet condition giving monofilament finish.