I purchased this item new today at an electronics store, but I bought the wrong model. I opened the package, so I couldn't return it, and I am now listing it for sale. The product is unused, only the package has been opened. Braun Series 5 high-performance replacement blade cassette, guaranteed 100% performance. - Model: Series 5 - Part Type: Cassette - Model Number: F/C 52B - Performance: 100% High-Performance Part - Made in: Germany Thank you for looking.