●【DOG SLIP MARTINGALE TRAIN COLLAR】Stainless Steel Chain Martingale Collar for Professional Training Gentle Control ●【SUS304 DOG CHAIN CHOCK COLLAR】Made of 304 stainless steel for maximum strength and durability. No discoloration, rust and fracture ●【DOG TRAINING CHOKER COLLAR SIZE】Up to 19 inches long, and 2.00 mm thick. Measure the dogs neck and reserve 2 inches of space to adjust the comfort ●【SLIP COLLAR FOR DOG TRAINING】Smooth sliding, no burr. Perfect closed loop without gaps, without dog hair. Use O-ring to slide in and out easily ●【WE ARE ALWAYS HERE FOR YOU】Any problems when using the product, please feel free to contact us. RISK-FREE! We will do our best to resolve your problem!