This is the 4488th most frequent Russian word.
вставками
"Inserts" or "interpolations."
In this sentence, 'вставками' refers to decorative or content-rich inserts added to the book.
Я купил книгу с красивыми вставками иллюстраций.
I bought a book with beautiful illustration inserts.
Here, 'вставками' denotes parts of material embedded into the door to modify its design.
Эти двери сделаны с вставками из стекла.
These doors are made with glass inserts.
In this context, 'вставками' refers to quotations or excerpts included for enhancement or emphasis.