The manufacturing of racquets are quite complex.
Shuttle House here shows the step by step process of making the raquet.
The design of the racquet can be done by autocad or solid works software.
Then a mold of the racquet is fabricated. The grommets were fabricated.
The website shows that the manufacturing part was outsourced to an OEM in China.
Subsequently, factory strings were attached and testing were done to ensure specs is correct.
As you can see, the manufacturing process is tedious and labour intensive. A lot of things can go wrong.