https://www.kickstarter.com/projects/1764129559/wooden-trainer-playing-cards-by-tcc Carefully selected walnut from North American, each piece is unique. Containing 7 pieces of solid wood, each thickness is about 2 millimeters. Through 3 crafts: polishing, carving, painting. Dozens of hours of manual polishing, by craftsmen with 10-year experience. Great handing and Smooth for Cardistry.