Shield Player dont Collide but Bullet yes

[system]

Hi i make shield in my game. How can i do that if Collider is bullet it crackling but if Collider is the player it can go in it????

Sorry for bad English.

http://www.freeimagehosting.net/image.php?2e9d250b50.png

[efge]

You could use Layer-Based Collision Detection.