Here is your sledge pounding solution for those who do not have access to a huge tractor tire or anything else to hammer on.  Do you live in an apartment?  Wife doesn't want a huge tire in the yard.  How about taking your sledge conditioning wherever you want, park, to a clients house, gym, camping, training camps.   StrongerGrip brings you a Green solution.  We are starting off with one size Half-Tire.  It's convenient, portable, and ready to take all you got.  Get your hands on a recycled, thick walled rubber, farm implement tire.  This is no regular "car tire".  It weighs approx. 35 lbs. Measures approx. 30" across, 15" high and 10"-15" wide.  Has an amazing feel.  Great height, and also lets you hit the arc at comfortable postures.  Excellent for hitting straight down and baseball style swings on each side.