Eliminate broken loops and cut material from thin tippets, also reduce line twist from keeled hooks. 

Looped end connects to fly line or Skagit Head

Swivel end connects to leader/tippet

T8= 8 Grains per foot, 7 IPS Sink Rate

T11= 11 Grains per foot, 8 IPS Sink Rate

T14= 14 Grains per foot, 9 IPS Sink Rate