I tried this once and it was painful, too small, difficult to use. I couldn't find the value in it.
The opening of the pump is a little too wide. The flimsy donut slides inside the pump too easily. If I use the pump without the donut, it sucks one of my balls inside, which is kinda painful, I had to order a better quality silicone donut to use with this pump.
This pump works great. Creates size and fullness. Feels erotic. Makes a lot of pre cum instantly. Get an aftermarket ring. The enhanced male has them for sale.
This product is well made and works great. Only wish it had came with better instructions. Also be careful or you can get your balls sucked in 😮
[****] think there is to much power in pump relief button does not work fast enough to let go