Tube connectors have integrated snap buttons that securely connect any 2 flow tubes. When you connect tubes, you can hear nice "Tick" sound. Once it's connected you can not pull out or bend out, but twist out. The connectors are made of polycarbonate, the strongest clear plastic available, and have built-in suspension that cushions flowlights for high impacts. Sean showed me how strong this is, I believe no one can break this :)