The product is of excellent quality. It might seem overpriced to some but the stickers are so well cut out and instructions are on point. I couldn't find a single product in the market that can match this product. The stickers are really helpful for beginners like me. Initially it's hard to pin-point which notes to play in a scale.
The product comes with an instruction manual on which a video link is also printed. It also comes with an applicator for some application of the stickers . The seller sends you some useful notes on the piano learning as soon as the product is dispatched.