The Cardsharp 4, even stabbier! Maybe the Cardsharp 4 ($90) won’t use that slogan, but it beats back Cardsharps 1-3 with a thinner and sharper design. The unit now comes with an all-aluminum knife and housing, a 2 part safety lock and a spring-loaded hinge to prevent sagging and keep everything flat in open and closed positions. No wayward slicing. Stainless steel material accounts for an even sharper blade. All this comes at a price though, as the Cardsharp 4 leaps in price from $23 to $90. Quite a bit more than a Swiss army knife, but the Cardsharp 4 looks much cooler cutting open packages and knifing paper.