What kind of rope should I use to skip rope for my boxing workout?

I bought a jump rope from academy two months ago and have realized my shoulders get tired from spinning it long before my lower body does. I was advised by a friend that a heavier rope would do for my boxing training. I am 6'1 and weigh 202 lbs, anyone have a good idea as to what weight i should get and maybe where I can find these heavy ropes?|||Between 2 and 4 pounds for the weight.





Something like this:





http://store.titleboxing.com/title-heavy鈥?/a>|||A leather jump rope would be best - check link





http://www.ultimateboxingbags.com/produc鈥?/a>|||you could literally just buy a rope from the hard ware store... that's what I would do if I was a wrestler...which I'm not...