Ravensburger Knitters Delight Puzzle 500pc ZrO2Y2O3 phase diagram, after Miller et al. [26] Download Scientific. Our Ravensburger 500 piece puzzles features an adorable trio of kittens relaxing in the knitting basket. This heart warming, family puzzle is the perfect way to spend a relaxing evening by the fire. Specifics: Box Size: 34 x 23 x 4 cm Finished Size: 49 x 36 cm Piece Count: 500 pieces Ravensburger puzzles are designed to be a positive experience. Following with tradition, Ravensburger puzzle dies are completely hand made from the grid design to the bending and forming of our steel tools; creating a perfect interlocking fit with no tearing or dust. No two pieces are ever the same shape! Extra thick cardboard pieces mean your puzzle will last for years and our fine, linen structured paper eliminates glare so you can really see the details. Ravensburger, bringing families together since 1891.