FeaturesThe needle can be struck with a hammer.Needle can be replaced without tools.Stainless steel springs are used for the spring drum to prevent rusting.Neodymium magnets are used to attach to steel parts.The main body is protected by elastomer resin for shock resistance.SpecificationsBody size Pro automatic winding: 25 x 100 x 35 mmSwipita: 36 x 156mmProduct weight: Pro automatic winding: 225g, Swivita: 400gMaterial: Pro self-winding unit: ABS resin, elastomer resin Spring: stainless steel Needle: spring steel Magnet: neodymium magnet Thread: nylonDouble ring: Stainless steel Rubber cover and protective cap: RubberThread length 5mAvailable weights: 100g - 1kg