Right now I have those constriction rings :

Putting them on is kind of a hassle, as I have to use an extensive amount of lube on the ring as well as on my penile shaft and glans and it s painful to get them down the shaft.
Are there any solid adjustable rings I could use ? I just found small ones which look more like a rubber rope than a real ring. I'd prefer not to use titan rings in case of emergency.