How do I find the UN number and Commodity Code of an Item?

You can find UN Number and Commodity Code information online.
1) When viewing a product page, if there are product variants (for example colour/size), you will need to firstly select the variant required. In the below example, we have selected the 'Grey', '135ml Cartridge':
2) Then click on the 'View Product Info' button. The Commodity Code, Country of Origin and UN Number will display in the side-bar: