When playing golf, categorize each of the following items as "useful" or "useless": Irons, putter, dumbbell, tees, skis, range finder, jeans, kayak.
Irons: Useful
 Putter: Useful
 Dumbbell: Useless
 Tees: Useful
 Skis: Useless
 Range Finder: Useful 
 Jeans: Useless
 Kayak: Useless