Herm Sprenger Ultra Plus Stainless Steel Training Collar with Center-Plate and Assembly chain. Stainless Steel. Available in 3.25 mm medium link only.
 
Comfort-plus version with swivel and snap hook 
For quick releasing the dog 
Classical style for dog training 
Flexibility between dog collar and leash due to the swivel 
For dogs with max. weight up to 40 kg