Both of our BREAKAWAY and NON-BREAKAWAY (Standard) Buckle Clasps look virtually the same as what you see in the product photos (black or white plastic clasp), but they work differently. The breakaway type is the more common version used for cat collars. It's also commonly called a 'Safety' or 'Quick Release' collar — when tugged on (with a decent amount of pressure), the buckle auto-releases to allow the pet to easily escape in an emergency without a human's aid. This could be beneficial if a cat had its collar stuck on something (like a fence, or in a fight with another animal outside, etc.). The Non-Breakaway buckle type is most typical for dog collars -- it does NOT release when tugged at. Typically, this type of clasp requires a human to open it (by pressing in the side-release mechanism). This type of buckle closure is what we recommend if you plan to walk your pet on a leash.Note: We have many cat & dog owners who purchase their collars with the NON-Breakaway option because they either intend to walk their pet on a leash outside or wish to avoid the greater risk of losing their pet collars outside. Ultimately - the decision is up to you. (Made By Cleo shall not be held responsible for any related effects resulting from one's decision to choose either type of buckle closure).For more details about our collar sizing and hardware options:https://www.madebycleo.com/pages/sizing-guide