You should be able to find silicone ones easily online... they're kinda cheap. Mine are 10-15 cm long, so when I cum with them in what happens is that cum burst makes them get outta the peehole. Not sure what would happen if they were the long ones (30-35 cm).
Anyway, when u cum and when u pee immediately after, the tip of ur cock burns a bit, but it goes away in half an hour, and u get used to it easily... You can even learn to enjoy the burning sensation 😁
Yeah this is why I think I'll like it, I love the feel of stuff moving through the urethral duct (like when I come). I think I will love it. It's just that the metal ones don't work. I'll try to find some, it's just because I insert it so deeply I don't want Alibaba quality :)
I heard they can be used for prostate stimulation too, though I guess silicone is too flexible for that and metal definitely won't work for me :(