The flexible hinge is one of the most important components in lamina emergent mechanisms (LEMs). so the design of a new type of lamina emergent torsional (LET) joint can play a key role in its movement performance. This paper presents double- and triple-series LET flexure hinges. designs the structure of the two hinges. https://www.relicsbook.com/product-category/autographed-framed-entertainment-items-other/