Professional-quality portable 30 inches x 42 inches drawing and drafting board with built-in parallel straightedge for all kinds of creative and technical applications. Perfect for students and those who need an accurate drawing surface but don't have the space for a full-size drafting table. Fully assembled! Aluminum straightedge with soft, rubber edges for enhanced grip, comfort and control. Straightedge glides smoothly up and down the board while the cross-wire and pulley system underneath keeps it parallel in any position. Crystal clear acrylic blade is 0.12 inches thick and includes inking edges underneath to minimize smudging. Blade clearance is 3/16 inches for use with foam board, cutting mats, and more. Straightedge has brake mechanisms on each end for secure, positive locking in any location on the board. Large brake knobs include rubber grips for comfort. Straightedge has top-mounted adjustment knobs on each end for fine-tuning parallelism. Especially useful when reinserting a drawing on the board for additional work. Smooth, white Melamine surface for bump-free drawing. Particle board substrate is 0.63 inches thick for strength and durability. Folding metal legs are set at an angle to prevent accidental collapse and include rubber-dipped ends to prevent scratching. PXB42 has 5 inches legs. Boards can be used in the elevated or flat position. Rubber grip tracks underneath allow front of board to overhang a table edge up to 8 inches . This increases the working angle and brings the drawing surface closer to the user. Compact, folding design for convenient transportation and storage. No assembly required. Ready to use. Drawing board is CARB compliant and all components are phthalate and lead-free.