Great Quality - Made of Grade A 0.25mm needle length 540 Titanium.Titanium won't bend or rust. | Our derma roller are the preferred size for beginners. | The roller is portable and easy to hold and use. You can carry it with you easily, or chose to simply use it at home | Quality materials - Crafted with premium titanium. You can comfortably use it for care. | If you encounter any issues, please let me know, and we will promptly resolve them to ensure your satisfaction as a valued customer.