ALVIN® PLB Lightweight Parallel Straightedge Boards - Alvin's PLB boards provide all the features of the PXB boards but in a lightweight, easy-to-carry version. Made from lightweight LB series boards that have unfinished wood veneer surfaces top and bottom, aluminum side edges and hollow honeycomb interior. Solid wood edges and center cross frames provide strength and rigidity and are strategically placed to support the handle and legs.