Sennheiser
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Vinyl Audio Stickers by Demon Graphics.
These great stickers are cut from quality materials and are OK to stick to bodywork or glass (inside or out). The price you see is for one decal and they are available in a host of colours and sizes from 4" long (see below).
If you want your graphic cutting in reverse for sticking to the inside of glass, then select 'Reverse' from the 'Mirror' option shown below.