PLAIN STRINGS
Nylgut, Nylon, Carbon fibre
METAL WOUND NYLON OR SILK STRINGS
Pyramid, Aquila, Savarez, Kurschner
Aquila Corde
http://www.aquilacorde.com/String%20Gauges.htm
Ian Watchorn
http://www.ianwatchorn.com.au/String%20Conversion%20Table.pdf
Gauges of Savarez & Kurschner will be found in Ian Watchorn's table.