PremoBond Bobbins Bonded Polyester Anti-Wick Thread BPT Size 138M (Tex 135M) Steel Grey 72-pack offers a high-strength, marine-grade sewing solution designed for demanding outdoor applications. Made from bonded polyester with twisted and plied yarn construction, this steel grey thread resists UV damage, mildew, and most chemicals, ensuring long-lasting seams in patio decor, canvas, awnings, and upholstery. Each pre-wound bobbin delivers consistent diameter and excellent sewability with anti-wick technology to prevent moisture penetration, providing durable, weather-resistant stitching with an average breaking strength around 20 lbs. The 72-pack ensures ample supply for multiple projects focused on outdoor durability and seam strength.