Trying to clear the lighting on nylon widths, made this page showing all the sizes I offer (2" & 1.5" not shown), 1 to 3/8th inches to show their size and how you can tell which size is right,
1 Inch Wide
For Large breeds, and some medium breeds of dog collars, leashes and large and medium harnesses.
3/4 Inch Wide
For medium breeds and some small breeds of dogs, and cat and small dog harnesses.
1/2 Inch Wide
For cat and small dog collars, and small harnesses, leashes, and etc
NOTE NYLON IS NOT RED ANY MORE IT'S BLACK
3/8 Inch Wide
For puppy collars, newborn up to 8 weeks, also can be used for kittens.
And for bird harnesses.