Защитная плёнка матовая.

Because the noun плёнка is feminine, and the adjectives must agree with it.

• защитная = protective
• плёнка = film / screen protector / protective film
• матовая = matte

Both защитная and матовая take the feminine singular ending -ая to match плёнка.

In Russian, the verb to be is usually omitted in the present tense.

So:

• Защитная плёнка матовая. literally: Protective film matte. natural English: The protective film is matte.

This is completely normal Russian. If you added есть, it would usually sound wrong here.

Russian can use both full and short adjective forms, but they are not always interchangeable.

Here, матовая is the normal, natural form when describing the item in a simple statement.

• плёнка матовая = the film is matte
• short form: плёнка матова — possible in some contexts, but less neutral and less common in everyday speech

For learners, the safest choice here is the full form матовая.

No. Russian has no articles.

So Защитная плёнка матовая could mean:

• The protective film is matte
• A protective film is matte
• Protective film is matte

The exact meaning depends on context.

Because защитная плёнка is the subject, and матовая is what is being said about it.

Structure:

• Защитная плёнка = protective film
• матовая = is matte

This is a very common Russian pattern:

• [noun phrase] + [adjective/predicate]

For example:

• Книга интересная. = The book is interesting.
• Комната большая. = The room is big.

Yes, but the meaning and structure change slightly.

• Защитная плёнка матовая. = The protective film is matte.
  This is a full sentence.

• Матовая защитная плёнка = a matte protective film / matte screen protector
  This is just a noun phrase, not a complete sentence by itself.

So if you want to describe the product name or label, матовая защитная плёнка is natural. If you want a sentence saying what it is like, Защитная плёнка матовая is natural.

It is nominative feminine singular.

Even though матовая is acting like the predicate in English is matte, in Russian adjective predicates with an omitted to be in the present tense are often in the nominative:

• Плёнка матовая.
• Книга новая.
• Машина быстрая.

So all three words here are nominative feminine singular.

Плёнка literally means film. Depending on context, it can refer to:

• thin plastic film
• covering film
• protective film
• screen protector
• old-style photographic film

In защитная плёнка, it usually means a protective film or screen protector.

плёнка is pronounced roughly PLYON-ka.

Important points:

• ё is always stressed
• ё sounds like yo
• the cluster пл at the beginning may feel difficult at first

So:

• плёнка ≈ PLYON-ka
• матовая ≈ MA-ta-va-ya
• защитная ≈ za-SHEET-na-ya

Also, in many printed texts, ё is written as е, but it is still understood as ё in words like плёнка.

In Russian, adjectives usually come before the noun they describe.

So:

• защитная плёнка = protective film
• матовая поверхность = matte surface
• новая книга = new book

That part works similarly to English.

Yes, very easily. This kind of short sentence is common in:

• product listings
• labels
• specifications
• ads

For example, a product description might say:

• Защитная плёнка матовая.
• Поверхность гладкая.
• Материал прочный.

In normal conversation, a person might also say it, but in product language it sounds especially natural.

Usually yes, in this context.

матовый / матовая / матовое means:

• matte
• non-glossy
• not shiny

So for a screen protector, матовая means it has a matte finish rather than a glossy one.