{"product_id":"twsbi-eco-fountain-pen-cosmo-onyx-trim","title":"TWSBI Eco Fountain Pen - Cosmo -  Onyx Trim","description":"\u003cp data-end=\"157\" data-start=\"109\"\u003e\u003ca href=\"https:\/\/www.instagram.com\/p\/DRhNYMeDrBx\/\"\u003eWatch Instagram Story I\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 data-end=\"157\" data-start=\"109\"\u003e\u003cem\u003eA Radiant Twist on a Beloved Everyday Writer\u003c\/em\u003e\u003c\/h3\u003e\n\u003cp data-end=\"572\" data-start=\"159\"\u003eThe TWSBI Eco \u003cem data-end=\"180\" data-start=\"173\"\u003eCosmo\u003c\/em\u003e elevates the classic Eco silhouette with a playful, luminous charm. Its crystal-clear resin barrel beautifully showcases your ink as it moves, while the Cosmo blue cap and finial softly glow to create a subtle cosmic effect in low light. Paired with a sleek onyx trim and a smooth-performing steel nib, this pen blends durability, style, and everyday practicality in one thoughtful design.\u003c\/p\u003e\n\u003cp data-end=\"763\" data-start=\"574\"\u003eThe piston-filling mechanism offers impressive ink capacity, and the inner-cap seal keeps the nib ready whenever inspiration strikes—ensuring clean, consistent writing from start to finish.\u003c\/p\u003e\n\u003cp data-end=\"985\" data-start=\"960\"\u003e\u003cstrong data-end=\"983\" data-start=\"963\"\u003eProduct Features of TWSBI Eco Fountain Pen - Cosmo -  Onyx Trim:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1416\" data-start=\"986\"\u003e\n\u003cli data-end=\"1025\" data-start=\"986\"\u003e\n\u003cp data-end=\"1025\" data-start=\"988\"\u003eTransparent resin demonstrator body\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1075\" data-start=\"1026\"\u003e\n\u003cp data-end=\"1075\" data-start=\"1028\"\u003eCosmo glow cap + finial for a luminous accent\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1122\" data-start=\"1076\"\u003e\n\u003cp data-end=\"1122\" data-start=\"1078\"\u003eOnyx-black trim and black-plated steel nib\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1178\" data-start=\"1123\"\u003e\n\u003cp data-end=\"1178\" data-start=\"1125\"\u003ePiston-filling system with generous 1.76ml capacity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1231\" data-start=\"1179\"\u003e\n\u003cp data-end=\"1231\" data-start=\"1181\"\u003eScrew-cap with inner seal to prevent ink dry-out\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1278\" data-start=\"1232\"\u003e\n\u003cp data-end=\"1278\" data-start=\"1234\"\u003eAvailable nib sizes: EF, F, M, B, 1.1 Stub\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1318\" data-start=\"1279\"\u003e\n\u003cp data-end=\"1318\" data-start=\"1281\"\u003eLightweight, comfortable resin grip\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1359\" data-start=\"1319\"\u003e\n\u003cp data-end=\"1359\" data-start=\"1321\"\u003ePostable design for balanced writing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1416\" data-start=\"1360\"\u003e\n\u003cp data-end=\"1416\" data-start=\"1362\"\u003eIncludes wrench \u0026amp; silicone grease for long-term care\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1456\" data-start=\"1423\"\u003e\u003cstrong data-end=\"1454\" data-start=\"1426\"\u003eWhy Choose this TWSBI Eco Fountain Pen - Cosmo -  Onyx Trim?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1768\" data-start=\"1457\"\u003eThe ECO Cosmo combines affordability with premium performance—ideal for beginners building their first collection and enthusiasts who appreciate reliability with a touch of fun. Its glow elements make it unique, while the transparent barrel and piston system offer a hands-on, immersive fountain pen experience.\u003c\/p\u003e\n\u003cp data-end=\"1768\" data-start=\"1457\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ci\u003eDue to the nature of the material, there will be some variation in the pattern seen here. We cannot honor special requests.\u003c\/i\u003e\u003c\/p\u003e","brand":"TWSBI","offers":[{"title":"Extra Fine","offer_id":42748361179254,"sku":"T_M7445500","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Fine","offer_id":42748361212022,"sku":"T_M7445510","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Medium","offer_id":42748361244790,"sku":"T_M7445520","price":58.99,"currency_code":"USD","in_stock":false},{"title":"Broad","offer_id":42748361277558,"sku":"T_M7445530","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Stub","offer_id":42748361310326,"sku":"T_M7445540","price":58.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0046\/3421\/4518\/files\/TWSBI_Eco_Fountain_Pen_-_Cosmo_-_Onyx_Trim.png?v=1776388510","url":"https:\/\/www.penboutique.mom\/products\/twsbi-eco-fountain-pen-cosmo-onyx-trim","provider":"Pen Boutique Ltd ","version":"1.0","type":"link"}