For the most intense ball-crushing play get this acrylic cock and ball crusher.
 
This cock and ball board can apply pressure to both the cock and balls or just the balls by simply inserting your cock and balls through the back hole. Then screw down the wingnuts to apply more and more pressure.
 
If you desire you can have only your balls crushed you can simply slip your cock through the handy cock hole on the other acrylic board.
 
Measurements: 

• 5 inches in length, 5.25 in width.
• The shaft hole measures 1.5 inches in diameter, ball hole measures 2 inches in diameter
  
  

Material: 

• Acrylic