Product preserve instruction:
1. Before first using, please wash with hot water or a cleaning agent to remove surface dust.
2. Don't use on open flames or over a direct heat source.
3. Don't pull and impact it violently or scratch it with sharp things.
4. Don't use abrasive soap or scouring pad to clean them.
5. In order to avoid the dust, don't direct exposure it to the air for a long time.