Amazon.com: Anti- Slip Aluminum Rulers for Drawing, Set of 3 Pieces (6, 8 and 12 inch) - Centimetres and Inch Scales for Precise Work, School and Home : Industrial & Scientific
Amazon.com: Aixuandocr Rolling Ruler, Measuring Parallel Ruler, Multi-Purpose Drawing Ruler for Drafting, Measuring, Calligraphy, Art - 12 Inch : Office Products
Amazon.com: K&S Engineering 9415 Round Aluminum Tube, 5/8" OD x 0.016" Wall x 36" Long, 2 Tubes, Made in The USA : Industrial & Scientific
Amazon.com: K & S Precision Metals 8266 Rectangular Brass Tube, 5/32" X 5/16" x 0.014" Wall x 12" Long, 1 Piece, Made in The USA : Industrial & Scientific