The sizes listed are the largest dimension.If the decal is wider than it is tall, the size listed is the width. If the decal is taller than it is wide, the size listed is the height. If the decal is round then the size listed is the diameter. Our cut vinyl aesthetic decals are super high-quality and made-to-order on air-release vinyl. No old adhesive here. These things stick to just about every surface when applied properly. We suggest cleaning the surface with a little non-streaking cleaner before applying your decal and following the included Instruction Card to ensure a bubble-free placement. Our cut vinyl decals all come with a clear carrier layer as well! This is a layer on the face of the decal that helps to place it exactly where you want it! Just peel the decal off the backer, place it, push it down being sure to work from the middle out towards the edges, and carefully peel back the clear carrier layer. Super easy and way easier to apply than a decal or sticker with it! Our decals can also be removed fairly easily from most hard, non-porous surfaces (i.e. metal, glass, plastic) if you warm them up with a little heat from a hairdryer (on low setting, not more than 5-10 secs of heat) and peel slowly. Most of the time they will come off clean with no residue! They are not re-usable after being removed though. TECHNICAL SPECIFICATIONS: Air-release vinyl makes application easy with no bubbles Lasts 3-5 years, usually more. Indoor or outdoor use Easy to follow application instructions on included Instruction Card It May be applied to any flat, smooth surface Easily removable without leaving gunky residue