{"product_id":"twsbi-diamond-580-replacement-nib-unit","title":"TWSBI Diamond 580 Replacement Nib Unit","description":"\u003cdiv class=\"product-description rte product-detail__gap-lg\" data-show-in-quickbuy=\"\"\u003e\u003c\/div\u003e\n\u003cp\u003eEasily change or replace your Twsbi Diamond 580 nib\u003c\/p\u003e\n\u003cp\u003eReplacement nib unit for TWSBI Diamond 580 fountain pens.\u003c\/p\u003e\n\u003cp\u003eBoth nib and clear Diamond 580 grip section supplied including metal ring. Also suitable for Diamond 540 pens, just swap out the old grip section.\u003c\/p\u003e\n\u003cp\u003ePolished steel nib engraved with TWSBI logo and branding, available in a wide range of nib sizes: fine, medium, broad, extra-fine, stub 1.1mm and stub 1.5mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout Twsbi\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003csection data-turn=\"assistant\" data-scroll-anchor=\"true\" data-testid=\"conversation-turn-4\" data-turn-id=\"request-WEB:a0597b92-0b4f-44ef-94bc-3b1b56e03d6e-1\" dir=\"auto\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv data-turn-start-message=\"true\" data-message-model-slug=\"gpt-5-3\" dir=\"auto\" data-message-id=\"41b7b446-bc2c-4d27-8292-32e25a041a59\" data-message-author-role=\"assistant\" tabindex=\"0\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"220\" data-start=\"0\"\u003eTWSBI is renowned for its precision-engineered fountain pens, specialising in smooth, reliable piston-filling systems. Explore our collection to discover modern designs built for everyday writing and lasting performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/hunterpaperco.com\/collections\/twsbi\" target=\"_blank\"\u003eView all Twsbi products we stock\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Twsbi","offers":[{"title":"Extra Fine","offer_id":56681145893250,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true},{"title":"Fine","offer_id":56681145926018,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true},{"title":"Medium","offer_id":56681145958786,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true},{"title":"Broad","offer_id":56681145991554,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true},{"title":"Stub 1.1mm","offer_id":56681146024322,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true},{"title":"Stub 1.5mm","offer_id":56681184461186,"sku":null,"price":30.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0274\/0427\/1699\/files\/twsbi-diamond-580-nib-set-replacement-nib-unit.webp?v=1780148112","url":"https:\/\/hunterpaperco.com\/en-us\/products\/twsbi-diamond-580-replacement-nib-unit","provider":"Hunter Paper Co. ","version":"1.0","type":"link"}