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It is applicable to the FA502, FA503, FA506, FA507 ring throstles. It features a good hardness and firmness. What's more, a stableness is inserted into the process of the moulding through plastic injection which has thoroughly tackled the rusting problem during the application. The plastic moulding is completed in one move, the yarn guide angle is always identical, demonstrates a good performance. The fixing way of this carbon fibre nylon guide is more easier than that for the iron guide. Its yarn guide hook is made of a special kind of wear-resistent steel plus an advanced hardening treatment, featuring a better finish and more durability than that of iron and easiness for mounting and dismounting. It has thoroughly tackled the rusting problem which is inherent to the iron yarn guide.