Sheet comes in to size of 21cm*29. 7cm as shown in last image. Easy to install just peel and paste on wall by arranging design like puzzle. Step 1: Preparation and installation the surface you wish to attach your decal to must first be clean and free from dust, grease or any other contamination. Freshly painted or lacquered surfaces must be allowed to completely cure before the decal is applied. We recommend waiting a minimum of 2-3 weeks. Step 2: Peel and stick simply peel those wall stickers off from backing paper and apply them on the design area. Step 3: Press firmly to squeeze out any air bubbles. Grab a cloth and give wall sticker few wipe down to ensue each wall sticker is firmly stick to the surface.