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

Take your beer on the go and leave the glass at home! These large 32 oz crowlers are a great replacement for heavy, fragile glass growlers. Fully compatible with the Cannular Pro Can Seamer when used with the Chuck Adapter for Ball 300 Ends.

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 Pro Can Seamer you will also need the CAN112 chuck adapter.

32 oz / 946 mL aluminum crowlers
Each case contains 149 cans and lids
300/307 x 710 Crowler
One case is enough for roughly seven 5-gallon batches of beer
Compatible with the Cannular Pro Can Seamer when used with Ball 300 Chuck Adapter (CAN112)
Water-based polymer interior coating
Please note that empty aluminum cans are very delicate, and up to 5% of the cans are likely to be dented or damaged in transit. If the cans were packed in a more protective (more expensive) cardboard box, the cost per can would be more expensive than simply having some dented/sacrificial cans arrive.