man be careful with these horse440's is how i got my throbosed vein. just make sure you are ready for them. i think the difference is with the 440 is you make a small ok sign with your hand and push down on the head of the penis while the other hand is gripping the base. some one correct me if i'm wrong. if i am maybe thats why im thrombosed
The two exercises are identical except for the rotary movement involved in the compression squeeze. People have seen tremendous gains with these, many consider it to be the most effective girth exercise there is.