Educator Quick Snap Bungee Dog Collar, Biothane, Waterproof, Odorproof, Easy Connect and Disconnect Clasp and D Ring with Comfort Bungee Loop, Adjustable for Custom Fit, 3/4-Inch, Black3 4" wide collar fits all Educator 300, 400, 500 and 900 series training collar receivers; all other models require 1" wide collar 33 inch collar for small to medium size dogs 10 pounds and up with neck diameter between 5 and 22 1 2 inches; can be trimmed to custom length with scissors For extra small dogs 5 pounds and up, we recommend the 3 4 x 22 inch mini double bungee collar High quality Biothane material provides unmatched durability and will not