Superman's original cape made from his swaddling blanket is indestructible.
Are other Kryptonian artifacts, materials, substances or products of similar super durability? Or, are only certain materials?
For instance, was his cape/blanket made from an organic material that could thus have "supercharged cells"? Or was it Kryptonian engineering that makes his cape, and original space shuttle (as @Richard pointed out) "super".
Strictly comic canon, but examples from any Age are fair game. Examples could be of other super items, or counter-examples of things from Krypton that are not indestructible/super.
(Please exclude Kryptonite, in its various forms, from consideration.)