Small Compression Springs Ballpoint Pen Spring 0.4mm Wire Dia 18 20 25 30mm Long Product Name: Small Compression Springs Wire diameter: 0.4mm Outer diameter: 4mm Length:18mm 20mm 25mm 30mm Material:Stainless Steel Colour: Silver Surface Treatment: Nature, Zinc-Coated Application:Replacement spring for click action ballpoint pens, water-based pens, neutralizer pens
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