How does it work? Thrust the needle through the fabric and pull up. Slide the needle ahead & repeat the process. Needle refills sold separate. Suitable Thread. No. 25 embroidery thread No. 40 lace yarn or any thread with the same thickness Suitable Fabrics: Dense fabric (medium/heavy-weight): such as poplin, denim, oxford, felt, etc. Resin part: Polycarbonate, Polyacetal. Needle: Stainless Steel, Brass. Cap: Polyethylene. Threader: Aluminum, Stainless Steel.