{"product_id":"mettler-seraflex-4-spool-set","title":"Mettler Seraflex 4 Spool Set","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eFour spools of Seraflex in the colors you'll actually reach for first — black, white, a soft grey, and a true red. Seraflex is Mettler's elastic sewing thread, and it solves a problem every knit sewer runs into: a straight seam that pops the first time the garment stretches. The thread itself gives, up to about 65% elongation, so the seam moves with the fabric instead of fighting it. Leggings, t-shirts, swimwear, sportswear, cuffs and waistbands, lingerie — anywhere a conventional polyester would snap.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eAsh Mist #0331, White 1 #2000, Country Red #0504, Black #4000\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eSpecs:\u003c\/strong\u003e 4 spools × 142 yd (130 m) · No. 120 · 100% PTT continuous filament · Nm 83\/3 · needle Nm 70–80 · Mettler item SFX4-KIT (Art. 7840)\u003c\/p\u003e","brand":"Mettler Thread","offers":[{"title":"Default Title","offer_id":48061896425637,"sku":"SFX4-KIT","price":14.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0442\/7871\/0437\/files\/SFX4-KIT.png?v=1785309791","url":"https:\/\/redrockthreads.com\/products\/mettler-seraflex-4-spool-set","provider":"Red Rock Threads","version":"1.0","type":"link"}