Sentence examples for what is it made of from inspiring English sources

"what is it made of" is correct and commonly used in written English.
It is a grammatically correct question and can be used in various contexts. Example 1: In a chemistry class, the teacher asked the students, "What is this substance made of?" Example 2: While shopping for clothes, a customer might ask the store clerk, "Can you tell me what this shirt is made of?" Example 3: During a home renovation project, the contractor might ask the homeowner, "Do you know what the walls are made of?" Example 4: In a cooking class, the chef might explain, "This dish is made of fresh vegetables and spices." Example 5: When examining a piece of jewelry, the customer might ask the jeweler, "What is this necklace made of?".