Dick Stretcher is a tool that you put on you in the following way: The large round part comes down your dick and fixes right in front of your balls. the other smaller ring goes through the head of your penis and fixes right beneath the head (just like the picture). then you stretch the tool to the maximum level that you feel comfortable with.
Difference from the pumps is that this tool can be used while the dick is not erect for as long as it is comfortable for you. There are no written doctrines for using it. Aim is for your dick to stretch and show as bigger at both erect and non-erect states.
If you are afraid of using vacuum or hydro pumps, this could be more flexible variant for you (at least you’re not putting your dick into a vacuum).