Smaller locks...

I have some of those locks, they are functional, and cute, but feature almost zero security. Easily unlocked with almost anything, a paperclip, for example.

 

They are quite pretty and are useful for caging when out and about together but a far more secure lock is needed when a subbie is left alone.

 

Locks are in general, insecure. If you can figure out how to pick it, you can remove it without detection.

A security seal of some type is a better solution.

 

Yes, it has a unique number embossed on it, and a cable which goes into a locking mechanism. Once the cable is secured, the only way to remove it is to cut the cable.

 

They cute and small but, are way too expensive