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"ULTRAFINE" is the finest building thread available on the market. It 'a real 12/0, consisting of parallel and crimped microfibers. The breaking load (450 grams), allows to use it with safety during construction. This thread is indispensable to easily bind all the flies of small and medium size;. being a crimped thread, (crimping of the fibers provides a good grip), it is unwaxed.