CardGear Slim - What is it? And, does it work? The CardGear Slim is a card sized sim/SD/eject tool holder. It fits many different configurations and is easily able to fit into the card holder section of a wallet. It was funded on Kickstarter where 1,832 backers pledged a total of $20,013. I backed this campaign on Kickstarter and received it yesterday. Since then, I have put 5 nano sim cards and a sim eject tool in it. The product is fully functional and sturdy. It goes for around $5-$10 which is not a bad price. Check it out on Kickstarter! This review has not been sponsored. All opinions are my own