These puzzles are laser cut from 1/8" thick steel and measure 5"x5" (3mm x 127mm x 127mm). The result weighs almost 1 pound (400g) which is satisfyingly heavy. Without decoration, both sides of each piece look identical which makes this is more difficult to solve than 20 pieces might suggest. Perfect for a coffee table or desk toy. We can laser etch a photo, logo, or text on some pieces or all of the pieces, as desired. Send a message to discuss before or after ordering. A mockup will be provided before beginning production. To preserve the fun of assembling a brand new puzzle without knowing the solution, the pictured sample is a prototype with a different pattern than the one I will ship. If you would like a picture of the final pattern then please ask, I'm happy to send it to you. Made in the USA.