{"type":"firestarter.listing","listing":{"id":"lst_ec3SYknb","product_name":"Magna Carta Mag 600 Fountain Pen True Flex Nib 5","category":"Fountain Pen","description":"\n\n\nA completely different experience from all the modern flex nibs you have used so far.\nThe Magna Carta Mag 600 fountain pen features a truly flexible 14k gold nib, on par with vintage pens. This flexible nib is fed by an ebonite feed that can support the ink flow.\nThe Mag 600 is designed inspired by hard-rubber pens from the 1920s. The clip is riveted to the body.\nTo allow the ebonite feed to absorb the ink, the pen must be filled by immersing the nib into the ink bottle, and the feed should be left in the ink bottle for a while.\nThe starting point of the fully flexible nib is EF (Extra Fine), and it can flex to a thickness of BBB (Triple Broad). Writing with a flexible nib can require effort and patience, and while this pen offers a true flex nib, flex nib pens may not be suitable for everyone.\nFull Flexible gold nibs have a different manufacturing process, which is risky and prone to defects. All pens are finally inspected at Galen. Instead of a standard cardboard box, they are presented in a special wooden box.\n\n\nReviews On YouTube\n\nProduct\nMagna Carta Mag 600 Fountain Pen 14k True Flex Nib 5\nDescription\nMade with high-quality ebonite and trimmed with 24K PVD gold plating, this pen offers impressive dimensions for a well-balanced, comfortable grip. Featuring a #6 Magna Carta 14K True Flex Nib and an ebonite feed housing, the Mag 600 effortlessly adjusts to varying levels of pressure for detailed lines or broad strokes. Includes a standard international converter and can also be used as an eyedropper.\nSpecs\n\n\n\n\n\nCondition\nNew\n\n\nBrand\nMagna Carta \n\n\nType\nFountain Pens\n\n\nColor\nCustom\n\n\n\nDemonstrator\nNo\n\n\nBody Material\nResin\n\n\nCap Rotations\n2\n\n\nCap Type\nScrew-cap\n\n\nCompatible inks &amp; refills\nBottled inks, Standard international cartridges (Schmidt K5)\n\n\nFilling Mechanism\nConverter (one included), Cartridge, Eyedropper\n\n\nGrip Material\nResin\n\n\nNib Size\n14k Flex\n\n\nNib Color\nGold\n\n\nNib Material\n14k Gold\n\n\nPostable\nNo\n\n\n\n\n\n\n\n\nTrim Color\nGold\n\n\nDiameter - Body\n14.5mm ","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5.jpg?v=1726730884","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-2_6c1b8380-13f6-46d4-8589-08bd9dd56784.jpg?v=1726730889","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-3_b11ae8e4-d410-47db-8767-3c5a94c2f04c.jpg?v=1726730896","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-4_5ed40825-6c6e-4b8c-8f24-81d8d6140bbf.jpg?v=1726730901","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-5_3ae6e79c-b7a5-4352-8ae4-a95e920dca0f.jpg?v=1726730906","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-6_2cab66e4-f985-4227-ad9c-d3c705db6e37.jpg?v=1726730912","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-600-Fountain-Pen-14k-True-Flex-Nib-5-7.jpg?v=1726730917"],"price":385,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:00.786Z"},"share_url":"https://firestarter.network/l/lst_ec3SYknb","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_ec3SYknb' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Magna Carta Mag 600 Fountain Pen True Flex Nib 5' and a budget_max comfortably above $385.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}