Shot Put - 5kg - Junior High School Boys' Standard - Unused Item - Shot Put Throw - Track and Field

I have kept this at home since acquiring it 2-3 years ago.
I have touched it, but I have never dropped it on the ground.
I have never taken it outside and thrown it.
I have wiped it with a cloth, but I have never used any chemicals such as rust inhibitors.
I weighed it on a scale just in case, and it showed 5.0 kg.