The PowerArm Softball Full Set is a full strength training system that is designed for all Position Players. A Door Hinge anchor encased in latex rubber (will not damage hinge) permits use year around, indoors or out. The Full Set includes: 3 Resistance Tubes, (8 lbs., 10 lbs. and 12lbs. of Resistance) - Official size Softball - Door Hinge Anchor (also for use on Post or Fence) - Backpack - and a PowerArm Brochure with Instructions. Players 8-12 years of age normally start with the green tube, players 13-14 start with the red tube, and players 15 and older start with the blue tube. Players with advanced body development may start with a more resistant tube. As strength increases players move up to the next color tube and once the blue tube is mastered, the next step is to add a second tube and finally all three tubes are used simultaneously.The perfect addition to every gear bag for every player, regardless of skill set. Carry the weight room in your bag!Visit powerarmsports.com for more items.