I bought the set of three red heads (technically identical to the orange model, says the vendor) and I could not mow over 30 m². First test: I hit a shot to lengthen the wire, on grass, on a soft ground ... I hear crackling like a but I figure it must be the thread that scrapes the hides ... I mow about 10 sqm, I give a blow: the thread goes .... I tell myself that this is a demo thread, I'll charge .... I disconnect my head ... Sounds a puzzle noise inside .... I open with a screwdriver (not practical system at all), everything is crumbling inside. I climb another head, I advance the wire, I 20m² I advance the wire ... crack !!! I go up the third and final head, I advance the thread: crack !! 0 m² shorn. This stew unnamed is made of a plastic BREAKING instead of a slightly flexible plastic, like all other heads trimmer. I said that the outside temperature was 18 ° C, there was no reason why it breaks.
I thought I was getting a good deal, it was a good idea to have 3 heads to avoid having to reload when one is empty, I have made myself !!! That is why they are sold by 2, 3, 4, 5 ... to dump a stock of non-compliant products
Look at the clasped and especially pictures: do not buy !!!