I purchased this product and did not receive a free sample.
Zonon Top Loaders – These are not great. They did not arrive in retail packaging as depicted in the listing.
Once opened, I compared them to offerings from better known brands such as BCW and Cardboard Gold. These Zonon top loaders could not hold a candle to them. They are yellow from the start and the quality control is non-existent. ALL of them had noticeable damage on them and were often dirty.
They are fairly sturdy so if you were to use them to send cards in the mail, the cards should survive just fine. However, they are not nearly as sturdy as options from the two previously mentioned companies.
If you are desperate for some cheap top loaders for mailing, I guess these will do. However I would not trust them with higher value cards or extended storage. In realms like trading card storage, you often get what you pay for and these are not worth the time or money.
