I know cap's shield is indestructible, are there any other objects like the shield that can not be destroyed?

The Crimson Gem, Mjolnir, and Scorpio and Zodiac Keys cannot be destroyed.

The Generator and Dumpster SOs are not removed from the game when used in attacks, but can be destroyed.

kewl man thanks. Do you know if that fin fang foom finger is destroyed when used in an attack?

It has no special properties. It is a simple heavy object.

It's a 3-d object, but not a special object. It's a standard heavy object, just like the silver Mjolnir is also a standard heavy object.

Isn't the silver Mjolnir also a heavy object?

So it is. For some reason I was thinking the two were different. Must have got it mixed up in my head with the 3-D shield object.