Welcome to BW, Valentine's Day edition!
This design reminds me of the Shelf shelf, but this Love shelf is different in that the letters can be separated and mounted individually, which gives it much-appreciated flexibility. Each letter is about 14 inches in height - the only info I can find for the width is that the letters have "varying widths depending on the letter." Really useful, Mr. Manufacturer.
The good news is that the shelf is only $60 - unfortunately, the supplier is located in the Philippines and will only ship outside the country for a bulk order, so you might have to put together a mass shelf-buying event to get yours.