Dây đeo cao su màu đen

The rubber is just firm enough that I don't have to fiddle with it every session, and the loop holds its position behind the glans without slipping. Took me a couple tries to get the tension right, but once it's on, it stays put for the whole 30 minutes.

The replacement strap fits snugly behind the glans and holds firm even during longer sessions, which was my main worry. It’s a solid, no-fuss fix that keeps the device secure exactly where it should be.