1.thickness polyester floss(840D 500D 630D 1000D 1260D) nylon floss:840D PTFE floss: 800D 1200D 1500D 1800D Polymer floss: 400D 2.floss longness 10m----100m as you choose. 3.stretchy fiber PTFE,nylon floss,polyester floss,polymer floss. 4.fiber features non-flying hair, no broken wires,the tension is very good. 5.key materials feature wax imported from Europe. our dental floss are gaining in popularity because of their fine quality,competitive prices and our honest dealings.