DIMENSION: 3 sizes available: S-3.0mm×50cm, weight 105g; M-3.5mm×55cm, weight 145g; L-4.0mm×60cm, weight 345g (length not including the 2 O rings). Nice silver color. It is suitable for medium and large dogs, and very runaway dogs. MATERIALS: Made of good quality steel, well chrome plated for strength. The surface of the chain is perfectly smoothed to avoid hurting the animal. RESISTANT: The collar is durable thanks to its chain structure, very resistant to bites. The chrome layer makes the collar waterproof and rust resistant. ✪Attention✪, do not leave the collar in water or rain for a long time, dry it with a dry cloth as soon as possible after getting wet please. DRESSAGE: Good design for training and other daily activities. The idea of the choke collar is intended for the training of a runaway dog by ensuring your control when the dog pulls suddenly. INSTRUCTIONS FOR USE: The collar is composed of a chain and 2 identical rings O-shaped at the ends of the chain, its use is a little