Most penis extenders are designed to cater to most sizes but if you are already on the larger end of the penis spectrum, then you might find that these items are simply too small for you. These items are designed to stretch so the rods are adjustable and can cater to most penis sizes up to 7 or 8 inches depending on the brand. But, it is important that you check out the specific measurements of the brand you are looking at to make sure it will work for you. And don’t forget to leave some room for growth! If the extender only just fits you know, there will be little room for any extra length. If you are willing to pay a bit more, then you will also find there are sets that have different length rods so you can swap them out as you start to gain more length.