Durable Plastic Material: Made from plastic. Ensures long-lasting use and resistance to wear and tear, providing reliable performance for your trimming needs. Perfect Dimensions: Size: 40.4x17.5mm, spool line length 2.5M, line diameter 1.5mm. Compatibility: Compatible with Titan 18v battery trimmers. Guarantees seamless compatibility and easy installation, enhancing your trimming efficiency. Auto-Feed Spool System: Automatic line feed. Simplifies the trimming process by eliminating the hassle of manually winding the spool, making your gardening tasks easier and more convenient. Value Pack: Includes 4pcs trimmer spools. Provides great value and ensures you have plenty of replacements on hand, so you're always ready for your next trimming session. .