This grind size chart reference card is definitely one for the coffee nerds. This credit card size reference tool is a handy piece to keep by my coffee station. God knows I keep forgetting the correct grind sizes for my various coffee brewing methods and this card is great at reminding me of the correct setting to use.The card itself is made from a very durable, weighty, and substantial piece of brushed stainless steel plate. It's not foil-thin, but more like one of those fancy metal credit cards.The etching is sharp and easy to read. The information looks accurate and is useful for anyone who brews with more than 2, 3, or more methods.On the back side, there's basic information on different types of roast levels available, and each is accompanied by the Agtron / SCA roasting color reference number. Not particularly useful if you don't roast beans, and I don't. Not yet anyway, haha. Then it's just fun information to glance at.Overall, this is a solid and durable reference card that's perfect for anyone who constantly forgets the correct grind size. Definitely a handy tool to keep by the coffee station. The card is well-made and well-produced, and I expect this to outlast my lifetime!