This is my Standard -  8 feet, 10 feet or 15 feet  - 8mm professional dog training long line slip lead, designed and handmade with passion and love by me (Peter) a professional dog trainer and behaviourist.
 
This lead is made from high-quality, light, soft, but strong, abrasion-resistant polypropylene multifilament rope braided of 18 strands. I have chosen Polypropylene because it gives me the best experience and precise handling. The material is lightweight, silky, shiny and has a smooth surface. Floatable, does not absorb water, dries very quickly and can be washed at max. 30 degrees.
This training lead is 8 mm wide and is suitable for most breeds.
This slip lead will not change size (within reasonable pressure) while training due to the snug push-button, (spring-loaded) stopper (toggle)
The lead is on both ends carefully welded, then hand stitched, and finally glued and bonded with the double PE plastic.
 
My goal is always to create something that works - safe, strong, durable, fun, and a pleasure to look at and hold while handling your puppy. I want to believe I achieved that. 
 
As a professional trainer, I prioritise safety and quality above anything else.
The lead is on both ends carefully welded, then hand stitched, and finally glued and bonded with the double PE plastic. 
 
I appreciate you considering or buying this little creation of mine, it really makes me happy if something that I put a lot of focus, energy and creative effort into can help or even bring joy to somebody else. I am grateful for helping me this way to keep going and doing what brings me joy. 
 
THANK YOU!
 
Tips from the trainer:
This slip lead is designed to communicate with the dog with gentle pressure and release of the pressure. 
The dog must be introduced, conditioned, and trained to yield to gentle lead pressure. 
The dog is not meant and should not pull into this tool!
It is a simple and basic training tool but requires some handling skills. 
Place the lead as high as possible, right behind the ears, and adjust the size on the dog's neck with a stopper to make it snug but comfortable - make sure there is no pressure on the dog's neck so you can fit two fingers underneath.     
 
To correctly and safely use a slip lead, seek advice from a professional dog trainer. 
 
NEVER LEAVE A SLIP LEAD ON A DOG UNATTENDED!!!