Iain Sinclair’s previous iterations of Cardsharps have been intriguing from the get-go – after all, wafer-thin cards that fold into knives are rather rare. Cardsharp4 takes this concept to the next step, ditching plastic for an all-metal construction that combines a 65mm-long surgical stainless steel blade with an ultralight machined aluminum body. Other improvements include a two-stage childproof lock, spring-loaded Nitinol hinges, and greater overall rigidity, further improving this already incredible knife.

Check it out at Iain Sinclair – roughly $90