The 5261C SL001 from Alpha Wire is a 2-conductor (1 twisted pair) multi-conductor cable with slate jacket and 24 AWG conductors, supplied in a 1000.0 ft (304.8 m) length.
The 5261C SL199 from Alpha Wire is a 2-conductor multi-conductor cable with 1 twisted pair, 24 AWG, in slate color, sold in 1000-unit lengths (1000=1000).