Thanks for asking a question on www.thisisyourbible.com.
You asked if a Sistrum were a stringed or a wind instrument. It is neither. It is a kind of musical rattle. The King James calls them cornets which is incorrect. A cornet is a trumpet-like instrument completely different from the rattle-like Sistrum.
The Sistrum originated in the religious rites of ancient Egypt. Here's how one online dictionary described it, "a metal rattle or noisemaker consisting of a handle and a frame fitted with loosely held rods." Sistrums are readily available for purchase online.
If you want to come to grips with what the Bible really teaches, why not take the free Bible study course on www.thisisyourbible.com? You may take this course either online or by regular mail.
This course will give you a background in the major themes of the Bible from Genesis to Revelation. As with everything we offer, there is no cost to you other than your time and effort. You will also have a personal tutor to whom you may pose questions either from the course itself or those questions which come to you as you read the Bible.
I hope you have found this helpful.