1. at the end of the (Core) must be based on the distance from the 0.1-1.5 mm. 2. There must be an arc on the front (the Front Bell Mouth) 0-NN0D35 mm. 3. There must be an arc on the back (Rear Bell Mouth) 0.1-0.7 mm. 4. insulation semiconducting, and both can be seen.
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