The phrase "writing instruments" is correct and can be used in written English.
Example: "I always keep a variety of writing instruments in my desk, including pens, pencils, and markers."
Be constant in your writings and make sure that you don't run out of writing instruments.
Writing instruments are often emblematic.
Home accessories, clocks, leather goods, writing instruments.
Even utilitarian items like writing instruments can offer sculptural interest.
The big sellers at Ashford.com are crystal, watches, writing instruments and leather items.
Montblanc has been marketing its luxury line of writing instruments, a k a pens, for 95 years, mostly to men.
Next to the king, a scribe holds a writing instrument.
But as a writing instrument it has possibilities".
Today I rarely read anything — book, magazine, newspaper — without a writing instrument in hand.
Now consider coupling fingertip flexibility with the precision of a writing instrument.
Until the 20th century, the calligraphy brush was the dominant writing instrument.
