How durable is it??? That's the real question that comes into play with a lot of String silencers is HOW DURABLE they are going to be. If YOU made it though, and it's cheap and easy enough to make, then it don't matter too much.
i watched a video i found on here on how to make them. went to the local sporting goods store and spent 2.99 on a pack of rubber silncers. tied them on tight. if they last the rest of the year, then thats 2.99 and 10 minutes well spent