The brand is “Ideal”.
These are wire connectors (similar in utility to wire nuts). But these are push-in style. They are code legal for all electrical work. But make sure you understand their pros and cons before you start using them in any electrical project.
I have three boxes of roughly 100 each (there should be at least 85-90 connectors left in each box).
One box of dual connectors. One box of triple connectors. One box of quad connectors.
See photos for what they look like.
~300 Ideal push-in wire connectors (Rockridge/temescal)
This offer has been gifted to someone and is no longer available.