One one the most well known names in dog training.  Herm Sprenger products are extremely durable.  Most trainers recommend these for a safer alternative to choke collars.  If placed properly this collar will not apply pressure to the trachea.  Individual links can be added or removed for a better fit.

2.25mm wire gauge.  Stainless steel . Fits 15" neck.  

 This ULTRA-PLUS Training prong dog collar offers more flexibility between the collar and the leash due to the swivel attachment.

Safe and easy to put on and take off due to the ClicLock closure.