These are custom made pieces (not made by LEGO) that are both Wooden train track and Duplo compatible. They are sturdy and made of ABS plastic like Lego Brand uses. These have been tested on my sons' wooden train track (Most are the same size: Brio, Thomas the train, chugginton, IKEA, Kid Kraft, Melissa and Doug, Kipipol, Hape and Bigjigs) and duplo toys. Any slight discoloration or shape of the base is from the 3D print bed this was printed on and does not affect the durability of the product. Green color could be a shade darker than shown above. The other tracks/pieces are not for sale and were used for the photo, you are only getting the 4 pieces shown if you bid. (If you would like custom colors like red, yellow, orange, blue, purple, white, gray or black please contact me and let me know. The print time for this piece is about 50 minutes, and depending on how many other orders are in line, custom color orders might take just a bit longer to fill, but no more than 3 days.) Feel free to ask questions. I do offer returns within 30 days if you are not satisfied. This item is from a smoke free/pet free home. If you have any concerns upon arrival, please contact me before leaving feedback so that I can take care of the problem first. Thank you for reading my ad and have a great day!