With its silky soft clear exterior, and liquid-like colored interior, there has never been a stroker like the Duo. Lube up the colored, textured channel, and the sensation is absolutely MIND BOGGLING. Well, actually not really mind boggling but that's what it says on the box. This IS a great stroker for the money and the thing I like about it is that it's nice and fat. There’s LOTS of padding between your unit and your hand. The inside DOES feel great and it IS a great deal for cheap money.
The ideal unit size for this sex toy is good for lengths up to 6 inches and ANY girth below 5.25 inches around.