The sharp point penetrates all types of fabrics for a professional serged finish. Works with polyester, cotton, rayon, and polyester/cotton blend threads. Use the needle system recommended by your Serger manufacturer. This needle is compatible with: Babylock - SL600/700/800, All BL series, Protage 403. Glove - All Models. Husky - SL3000 series, 34D. Janome - 100, 200, 300, 400, & 500 series. Toyota - SL3400, SL3403.