READY ASSEMBLED MECHANISM FOR EASY ASSEMBLY Can be applied up to a diameter of 120 cm Can be applied up to a diameter of 70 to 120 cm Numbers are 8 cm long Number Thickness is 5 mm Material WOOD (MDF) Mirrored Plexi (Not a Sticker - NON-DEFORMABLE DURABLE MATERIAL) Numbers are attached with double-sided tape. Double-sided tape is adhesive on the back of the letters. The box contains a meter. Clock Mechanism: Silent Sweep Movement. Specially Designed Laser Cut Hour and Minute Hands are made of metal. It works with 1 AA battery. Ready to Install. You can apply directly to the wall by removing the protector behind the pieces. There is also protective gelatin in front of the plexiglasses. You can use a damp cloth during cleaning.