This product is a pack of 100 plastic replacement blades specifically designed for cordless trimmers and grass trimmers. The blades are universal, making them suitable for a variety of different brands and models. Made from durable plastic, these blades are easy to install and provide efficient cutting performance in the garden or patio. Ideal for keeping your outdoor space well maintained, these blades offer a convenient and cost-effective solution for trimming tasks. They are unbranded , they are not indestructible and they will break. They are cheap and you will use many of them. They are right to fit on the strummer and if it’s an old tool some wd40 would help. Thanks . They are NOT indestructible and will break, some feedback has been these are very tight to attach with opening being 0.7mm. Thanks