SM= Single Mode 9/125 Fiber Core (Yellow Rings on Connector) 

Ultra Light cable is a strong, flexible cable with a diameter of only 4.8 mm., very useful in controlled environments like studios and film sets. Ultra Light cable is bringing you smaller drum sizes and less weight. 

Specs

• four cores of protected fiber
• single mode 9/125
• outer cable diameter 7.5 mm.
• color coded (four yellow rings for 4Core single mode)
• cable length 200 meters in total
• robust male cable connector on both sides
• wound on Schill GT380 drum