https://milesherndon.com/blog/sales-sheet

https://www.psprint.com/resources/include-in-sales-sheets/
"Sales sheets are a great way to show off a product or service to prospective customers. Basically, it is a quick overview of the product or service with all the sales information available on a sheet of paper. It’s a quick and easy way to showcase your product and give out at trade shows, sales calls or retail locations. It can also be part of a larger marketing or promotion kit. You want your sales sheet to be concise and to the point. Do your best sales pitch for the product or service without getting bogged down into too many details. Think of it as a sales synopsis, highlighting all the important features for the customer."


https://www.infopedia.pt/dicionarios/lingua-portuguesa/folhe...

Folheto: impresso de uma ou mais folhas com informação de natureza promocional ou publicitária e geralmente dobrado em duas ou quatro partes

https://www.infopedia.pt/dicionarios/lingua-portuguesa/panfl...

Panfleto: folheto informativo ou publicitário

Pergunto-me se não há alguma "falha" no termo por parte do autor.

Encontrei esta conversa interessante:

Sales Sheet Vs. Sell Sheet?
I would have guessed that a "sales sheet" had some sort of sales data on it too too, but at least I had an idea in mind about what that meant.
I had no idea what a "sell sheet" was, so I googled it and got that understanding (that it's a type of brochure) from what I read there.
https://www.englishforums.com/English/SalesSheetVsSellSheet/...

A sales sheet, also known as a product datasheet, sales slick or sell sheet, is a tool that relays product or service details, such as features, benefits and pricing in a one-sheet format. Small business owners offer sale sheets to help customers make buying decisions, as well as sway decisions. The key to making a sales sheet is to use brief bites of pertinent details and display those details in a memorable way customers can review with ease.
https://smallbusiness.chron.com/make-sales-sheet-45963.html

Exemplo de uma ficha técnica/comercial:

http://www.topcolor.pt/uploads/produtos_ficheiros/352-corite...

Proposta de Sistema de Fichas Técnicas de Produto Acabado realizado na Unicer Cervejas
https://repositorio-aberto.up.pt/bitstream/10216/59388/1/000...

Parece que os termos são usados como sinónimos, mas pelas definições que li são conceitos diferentes ("sell sheet" seria uma "brochura", enquanto "sales sheet" seria uma "ficha comercial").
Por outro lado, se o termo "sales sheets" tiver a ver com o âmbito económica de uma empresa, então, concordo com a proposta da Teresa.

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Note added at 5 hrs (2019-04-17 13:39:47 GMT)
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NOTA:

E a sugestão ficaria no plural: "fichas técnicas/comerciais".

https://www.google.com.br/search?biw=1108&bih=701&ei=B863XOb...