How do I Make this Change The Shape of A Specific Brick?

So, I have this script here, that changes the mesh of any brick that touches it. However, I do not know how to make it specific to a certain type of brick. For example, only when a brick called "Tycoon brick" touches it, it only effects that brick; and when bricks like those that are part of characters touch it, it does not change their shape. This is what I have to start, but I don't know how to make it brick specific.

z = script.Mesh 

function onTouched(part) 
z = z:clone() 
z.Parent = part  
end 
script.Parent.Touched:connect(onTouched)

Basically, the mesh is inside of this script, if that helps!