Opening was too small. Not wide enough for my use.
My wife and I have both enjoyed the mamba extension. It provides a bit of extra thickness and length to my cock that delights my wife. She loves the fuller sensation it provides and has had multiple orgasms each time we used it.
I like the nubs inside the sleeve of the extension. They massage and stimulate my cock on every stroke into my wife. I have ejaculated into the extension each time we have used it.
The only issue Is it is difficult to get the ring that secures it from slipping on and off my balls. If your testicles are large then getting the ring on and off is a challenge. Aside from that however the ring holds the extension securely in place and held up to some vigorous deep and fast strokes in and out of my wife’s pussy. Overall an excellent extension. My wife and I have both came each time we used it. Especially fun role playing and pretending she is getting drilled by a strangers big cock.