{"product_id":"twsbi-fountain-pen-eco-cosmos-blue-with-onyx","title":"TWSBI Fountain Pen - ECO Cosmos Blue with Onyx","description":"\u003cp\u003eMeet the TWSBI ECO Cosmos Blue, where elegant design meets practical engineering. This eye-catching fountain pen showcases a vibrant cosmic blue cap paired with sleek onyx-black trim, while its transparent body gives you a front-row view of the piston-filling system and remaining ink. The cap posts conveniently on the back, and an inner seal keeps your pen fresh when not in use. Filling is refreshingly simple: unscrew, dip, and screw back. Whether you're just dipping your toes into fountain pens or you're a seasoned collector, this dependable everyday writer delivers smooth performance and timeless appeal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cbr\u003e- Type: \u003ca href=\"https:\/\/endlesspens.com\/collections\/fountain-pens\" target=\"_blank\" title=\"Fountain Pen\" rel=\"noopener\"\u003eFountain Pen\u003c\/a\u003e\u003cbr\u003e- Body Material: Resin\u003cbr\u003e- Cap Type: Screw\u003cbr\u003e- Filling Mechanism: Piston\u003cbr\u003e- Nib Material: Steel\u003cbr\u003e- Postability: Yes\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003cbr\u003e- Capped Length: 5.45 in (138.4 mm)\u003cbr\u003e- Length of Body: 5.125 in (130.2 mm)\u003cbr\u003e- Length of Cap: 2.375 in (60.3 mm)\u003cbr\u003e- Diameter of Body: 0.5 in (12.7 mm)\u003cbr\u003e- Diameter of Cap: 0.6 in (15.2 mm)\u003cbr\u003e- Diameter of Grip: 0.4 in (10.2 mm)\u003c\/p\u003e","brand":"TWSBI","offers":[{"title":"Extra Fine","offer_id":44965493407920,"sku":"M7445500","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Fine","offer_id":44965493440688,"sku":"M7445510","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Medium","offer_id":44965493473456,"sku":"M7445520","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Broad","offer_id":44965493506224,"sku":"M7445530","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Stub 1.1mm","offer_id":44965493538992,"sku":"M7445540","price":58.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0117\/8252\/0932\/files\/TWSBI-Fountain-Pen-ECO-Cosmos-Blue-with-Onyx.jpg?v=1771016212","url":"https:\/\/endlesspens.com\/products\/twsbi-fountain-pen-eco-cosmos-blue-with-onyx","provider":"EndlessPens","version":"1.0","type":"link"}