A buddy of mine is a bit of a tight a$$ and didn't want to pay for stick on weights. It seems kinda redneck-ish, but you can use the cheap plastic BB gun pellets from walmart for this as well. Had them in my 33x12.50x20 nitto trail grapplers for over 15000 miles. I agree with Hock, they seem to do an in balance/out of balance dance. It is rythmical, very similar to a sine wave, but was very very mild and the wear on the tires was great.(even, no cupping or anything odd) Measure out a cupful, chuck 'em in the tire, mount the tire, and drive. No bags, nice and cheap, self balancing as your tires wear, driving down the road. I will be using them on the new truck when my 37x13.5x22's are ready