The product material is solid, , long service life. Can be used as a spare part to facilitate the replacement of your movement winder Item Type: Repair Tools & Kits Item Name: Watch Crown Stem Movement: Fit for ETA 2824-2 2834-2 2836-2 Movement Color: Silver Material: Metal Package Contents: 50 x Watch Crown Stem Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.