FENLI is an authoritative global manufacturer of commercial-grade gua sha for back knots implements, serving physical therapy chains, chiropractic clinics, and wellness equipment distributors. Operating out of state-of-the-art ISO9001-certified manufacturing plants, FENLI utilizes high-precision CNC multi-axis milling, automated edge polishing, and 3D coordinate quality testing to ensure every back scraping implement meets strict edge smoothness standards. We utilize biocompatible, heavy-density materials including 316L surgical stainless steel, natural bianstone, and durable zinc alloys that offer optimal mass for deep tissue release. FENLI provides complete OEM/ODM production capabilities, including custom edge geometries, wide-body handle designs, laser logo engraving, and bespoke retail packaging solutions. Partnering with FENLI guarantees enterprise clients direct-factory pricing, scalable production volume, and reliable global supply chain support.