I purchases these with the 2B because the silicone straps were out of stock. The tightening mechanism works well but you have to be careful not to get skin caught in it as you tighten it. The conductive plate is large and flat so it's not the best fit for a cock but with some care and some lube you can get a decent connection. If you get harder or softer the connection can easily alter. All in all I'm happy with them but I have a feeling the conductive loops will be far superior.