YOUR PURCHASE HELPS A DOG RESCUE: For every collar sold, we donate an identical collar to a dog rescue. Dog rescues are in constant need of dog supplies. We donate 1 for 1 for every purchase. By purchasing one of our dog collars, you receive a premium high quality collar and you donate one to a rescue. Together we can support dog rescues with a never ending supply of collars. DOG RESCUES: Each month we donate to different rescues throughout the USA. At the end of every month, we tally up the number of leashes and collars sold. Based on the number, we determine how many rescues we can donate to for that month. We donate down our list of rescues until each one has received a donation and then we go back to the top of our list. In special cases, we will donate to rescues out of turn based on their immediate needs. QUALITY CONSTRUCTION: Our chain martingale collar is 1" wide (3/4" small size, 1/2" x-small size) and made with a 2mm nylon. We use a stainless steel chain that won't rust and O-ring and a sturdy nylon snap buckle that has a lockable tab to prevent accidental release. The metal adjustment slider has a loop for dog tags and charms. Separate Easy Loop Tag Holder used under license from Cycle Dog Inc. US Pat 9,027,515