Popular with agility trainers, but handy for any dog owner. Leash and collar all in one. The adjustable leather slide keeps the collar loop from slipping off, yet releases slightly when the lead is in a relaxed position. (The 1/8" slip lead does not have a leather slide.) Soft, solid-braid, polypropylene rope, with non-corrosive bright brass hardware and real leather to strengthen the splices. The 1/8" diameter is recommended for dogs under 15 lbs. The 3/8" diameter is recommended for dogs under 50 lbs. or very well trained. The larger, 1/2" diameter is for dogs over 50 lbs. The small dog lead is 4 1/2" long and the others are available in 4' & 6' lengths.