Size XSmall is 1/2" wide and fits neck sizes from 8-11".
Size Small is 1/2" wide and fits neck sizes from 10-13".
Size Medium is 3/4" wide and fits neck sizes from 13-17".
Size Large is 3/4" wide and fits neck sizes from 17-21".
Matching leashes are 4 feet long and plain. 1/2" Matching Leash or  3/4" Matching Leash

Usually ships in 3-5 business days. Can take 2 weeks at times. .