It is manufactured as 2 layers of 2.7 mm mdf with a diameter of 40 cm. in this way, the design offers a 3d image. you can send us your different color requests after ordering. a silent clock mechanism is used. there is no battery in the product box, it works with 1 aa battery. more than 5 stocks are offered to be sold at the campaign price. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.