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Business cards and other similar things do fit inside the pouches, but the pouches themselves are at least 1/8 too wide to fit in a standard billfold slot - so if you wanted these for that purpose, don't buy.
I had high hopes for this laminator after reading the reviews. However, I have found the machine is extremely temperamental and usually does not 'take' the laminated paper. I have to position and reposition my paper about 50 times before it goes through the machine. Even with that, approximately 50% of my pages get jammed and ruined. The "Anti-Jam" button on the machine is useless. I would not recommend this machine to anyone.