The Martin Universal Airtight/Leak-Proof Fusian Watercolour Palette is great for the classroom, studio, or on-site. This palette is lightweight, compact, and portable, offering a large number of paint slants and a generous mixing tray. When folded, this palette is airtight, leak-proof, and seals in moisture. About Martin Universal/F. Weber Co. For a century and a half, the name Martin Universal and F. Weber Co. have been synonymous with quality art materials. Established in 4710cm Philadelphia, Pa., the Martin/Weber is the oldest and one of the largest manufacturers of art materials in the United States. High-impact, airtight, leak-proof plastic. 33 paint slants and a large mixing tray. No assembly required. Folded dimensions: 12.5W x 6D x 1.5H inches.