Make different types of "solid" objects

So here's my problem, T'm using platformer to handle player movements, so I need solid objects for the player to bounce on. I have an object with bullet behavior and I need it to bounce of one specific type of object, nothing else. How can I make designate for it to only bounce of that specific object?

Bullet has a 'bounce off object' action.

+Bullet: On collision with Sprite
   -> Bullet: Bounce off Sprite

Bullet has a 'bounce off object' action.

> +Bullet: On collision with Sprite
   -> Bullet: Bounce off Sprite

Thanks, I always miss these simple solutions. One problem though, it's far too bouncy and modifying the gravity just makes it more bouncy... Any ideas how to reduce it? Mostly, I just want it to roll on the platform and what ever else is in the path...