High quality materials; : The cutter head is made of high quality solid aluminum, which is strong and durable, resistant to damage. wear, durable and can be used for a long time. Shock-absorbing design: it has low vibration, shock resistance wear, high resistance, compactness practical and ensures a long service life. This product is easy to use. replace and is a great accessory for lawn mowers. grass. High quality nylon yarn. : The nylon line is made of durable nylon and has high cutting performance which can easily do the lawn cutting job. Easy to use install: design to install; double head, automatic tip. And the line can be recharged. Suitable for; most lawn mowers; grass. Application: Convenient, compact and easy to clean; carry, it is a great accessory for lawn mowers. grass. Suitable for applications on large surfaces up to ” 30 cm in diameter.