How to make air hockey type bounces when colliding?

Cabaco

I have a game that balls spawn in direction to the center and now they are colliding and my problem is that the bounces arent realistic and the ball gets through my own ball when dragging.
Concluding I somehow want to make air hockey type collisions. But how?

jonmulcahy

play around with the density and restitution of both objects

Cabaco

How much density should I put? Already made it 2 restitution which is the max possible

jonmulcahy

not sure, play around with it