These are a super great training tool! I highly recommend them. Training Collars were Black Dog's first ever product, they were designed for training without the harshness and pain of a chain choker. 
 
They are also generally used as a security collar because of the non-slip security of a martingale design - the design helps prevent dogs slipping out of their collar.
 
Careful consideration to design of the collar, components and choice of materials in relation to the size of dog,  has enabled Blackdogwear to produce a highly effective Training Collar that is robust and looks great.
 
Adjustable - to exactly and comfortably fit a dog's neck, and can be adjusted as your dog grows
Extremely easy and safe to use
Simple to fit
Unique "Designer Dog Wear" appeal backed with Black Dog's quality guarantee
Will not over tighten on a dog's neck 
Will not cut, mark or remove a dog's coat