Get an essential success in obedience training of your pet with this neck tech sport collar from Herm Sprenger. If you want to solve your dog’s behavioral problems, then consider this supply with the modern design.This neck tech collar has equally arranged prongs, a D-ring, a center plate and a click-lock buckle with an extra protector to avoid unexpected unlocking. It can withstand the load up to 440 lb/200 kg.Prongs have smooth surface not to cause discomfort to your canine. Center plate provides balanced distribution of the pressure. Due to the smart design of the buckle it is possible to lock and unlock this tool easily and quickly.The 23 3/5 inches/60 cm size will do for dogs with 21 inches/53 cm neck size. Also, you can adjust the size and look by adding/removing links and with special nylon cover.How do I measure the neck size of my dog?Please put a measuring tape closely to the fur right behind the ears and under the jaw.Mind that two fingers should slip between the collar and the dog's neck. Or you can measure his neck and add two inches.When the collar is on his neck it should allow you to slide two fingers under the collar and your dog's neck.If there's extra room, you need a smaller size and you should remove links. If both fingers don't fit, the collar is too small and some links should be added.This collar is made of black stainless steel. It is strong as the traditional steel. But this material is much more resistant to corrosion. The collar will not rust even in the conditions of seawater or high humidity.NOTE!This black stainless steel collar is suitable for canines with dark fur and those dogs who are not reactive to nickel.The collars made of black stainless steel are not advised for dogs with light coat, as because of normal abrasion processes they may stain fur.