From the product description, check product page for current description, price and availability:

Aluminum cans offer 100% protection from UV and other wavelengths of light that are harmful to beer. There’s still great debate surrounding whether cans or bottles are better at keeping beer fresh, but if done correctly, cans are theoretically the superior option. When a crown cap is crimped onto a bottle, the lining of the cap can form an imperfect seal on the bottle, allowing small amounts of oxygen in, as well as small amounts of CO2 out. Over time this can result in oxidation of the beer and lost carbonation. Seamed cans form a much better seal, which can prevent these issues

Aside from better protection, aluminum cans are undoubtedly the safest option for sharing and enjoying your homebrew. Bring your canned creations tailgating, camping, boating, or crack a few open poolside without the worry of broken glass!

To use these cans with the Cannular Can Seamer you will also need the CAN103 table spacer.

330ml/11.1 oz aluminum cans
Each case contains 300 cans and lids
One case is enough for roughly five 5-gallon batches of beer
Compatible with the Cannular Can Seamer when used with 330ml table spacer (CAN103)