CarbonLite Tools Carbon Fiber Wrenches Hothttp://www.tool-rank.com/media/listing/photos/thumbnail/300x300s/d4/8e/6d/CarbonLite-wrench-55-1399584183.jpg
When regular metal wrenches are too heavy for you, CarbonLite wrenches might be the answer. Made with 25+ individual layers of resin impregnated carbon fiber cloth, a set of 5 CarbonLite wrenches weighs in at only 6.7 oz.
There is a reason they use carbon fiber in everything from F1 race cars to spacecraft, the stuff is incredibly strong and lightweight. But as strong as it is, it is not the best material for every application. So while the main body of the wrench is made out of carbon fiber, the teeth are made out of hardened stainless steel.
If you are worried about strength, CarbonLite says their wrenches are "strong enough for normal use that a normal wrench is intended for". In other words, you can't use them as a hammer, a pry bar, or in any other way you probably use your metal wrenches.
The use of carbon fiber is not without its drawbacks though, there is the possibility of getting carbon fiber splinters in your hands, so they do recommend wearing gloves. The other downside is the high price of about $140 for a set of five wrenches (3/8", 7/16", ½", 9/16", 5/8" or 10mm, 12mm, 13mm, 14mm, 15mm).