How to read wire wrap labels?
The part number (P/N B-30-1000) indicates it is AWG30 (and black and 305m = 1000'). 

The part number is printed onto a pre-printed 2-color label which contains the UL specification numbers and well as the brand. UL is "a global safety consulting and certification company headquartered in Northbrook, Illinois. It maintains offices in 46 countries."

The relevant UL specification number in this case is UL1423 since it's AWG30. The standard is "Appliance Wiring Material UL 758". 

That tells you (follow the link) that it's 105°C Polyvinylidene Fluoride (PVDF) Resin Insulated Wire, and provides some test parameters.