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Craighill Venn Puzzle | Stainless Steel A kickstarter favorite. The Craighill Venn Puzzle in Stainless Steel is a beautiful mechanical puzzle comprised of three identical pieces. Each piece is die-cast in stainless steel that makes up one-third of the sphere by volume. Challenging and intriguing puzzle for a beautiful desk accessory. Keep it on a desk, shelf, or coffee table as a decoration, game, or paper weight. Specifications: Casted from molten stainless steel in a ÔdieÕ or mold at temperatures over 2500¡F. 2.25" D (same as a pool ball) Die-cast Stainless Steel Weighs 1 lb, 12 oz Comes with a small brass display stand