Here is a set of striking sticks that let you work on your striking while going easier on your hands and shoulders. The Sanabul Striking Sticks are ideal for boxing and MMA. They are made with Santec Ultra Light Foam to absorb your punches well. They can be used to work on your speed, accuracy, and head movement.
These sticks measure 22 inches, weighing 1.25lbs in total. More info is available here.