This is an extra large proto-shield, specifically designed for the Mega! It comes with PCB, two buttons and a full set of stacking headers. You can stack this shield easily since it comes with extra long female headers

The kit includes:
 

• 1 x MEGAshield PCB
• 2 x tactile switch
• 1 x 3-pin male header
• 1 x 2x3-pin stacking female header
• 1 x 10-pin stacking female header
• 5 x 8-pin stacking female header
• 1 x 6-pin stacking female header
• 1 x 2x18-pin stacking female header
• 1 x jumper or shunt