It's very hard and will wear well and can be adjusted. Finger picks can be quickly and effectively to enhance the bass and guitar playing. They come in just one size but you can bend them to fit your fingers and your style of playing. 100% brand new and high quality Material: Stainless Steel Product Type: Finger pick Size:app.3.1cmx1.6cm/1.2''x0.6''(L*D) Color: As the pictures show Quantity:3Pcs Package includes: 3Pcs Guitar Pick  Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm.