Filler (Optional): Cotton yarn. Tape (Optional): Cotton paper or Non-woven fabrics. Jacket: Extruded PVC; 18AWG~13AWG,Minimum average thickness 0.76mm, Minimum thickness at any point 0.61mm; 12AWG~11AWG,Minimum average thickness 1.14mm, Minimum thickness at any point 0.91mm; 10AWG, Minimum average thickness 1.52mm, Minimum thickness at any point 1.22mm; Flame test: UL VW-1, CSA FT1 Environment protection: RoHS / REACH Package: 500FT -1000FT Roll/wooden drum UL SJT manufacturers website:http://www.biadi-cable.com/ul-wire/ul-sjt/