I have been pumping on and off for 10 years, over that time I have gained girth and some length. A side effect is the growth of 4skin, at the beginning after several months I noticed my skin started to grow, that led me to 4skin restoration and the benefits of additional sensitivity. I would suggest you start with a flared tube, probably 1.75 or 2 inches depending on the girth of your cock. The concept is simple, get a tube that is a bit larger than your cock fully boned, pump to fill the tube (once that starts you can stretch your cock out and repeated stretching adds a bit to the length), once one tube is filled you move up 1/4 inch to the next. I have a routine, first a real warm wash cloth, directly on your cock, then stretching with lube leading to a bone, once boned or stretched out, insert to the tube and use low pressure. I pump for 15 minutes at low pressure (slowly packing out the tube starting at the base), then take a 5 minute break with more massage, lube (abalone) and stretching, then another 15 minutes followed with a 5 minute break. Another key is to stay max hydrated, as that moves more fluid into your cock and brings on the thickness. Once I pack the 2" tube, I move to the 2.25" tube... after about 90 minutes I have added length and am as thick as a beer bottle. A stretchy cocking adds to the pump afterward. You want to do a bit of research on tubes, the best pump I have found is a brake bleeder (solid brass) from Harbor Freight.... other outlets sell the same product for double or more. Good luck and the feeling of pumping is highly pleasurable.