Review on Ideal 2 Port Non Twist Connector Stranded: The Ultimate Solution for Secure and Efficient Cable Connections by Cedric Edwards

They're great for connecting electrical switches and outlets. They are smaller than wire nuts, grip better and make the job a lot easier. The only downside is that they cannot be reused. So make sure you are secure before connecting. It's also better to go with a core than stranded wire, they work, but it's not as good a connection as a core. Overall happy with the purchase