Material: It's made of durable copper,durable and sturdy,not easy to rust and break. Dimension: The finger protector is medium size,approx. 1.7x 2.6 cm/ 0.68 x 1 inch (L x H). It's adjustable,fit for most people fingers. Package contents: 3 pieces of finger protectors,enough for you to use for a long time. Wide Applications: It can be applied for needlework,sewing,embroidery and so on,It's a good tool for everyone who likes the sewing to protect their fingers well. Effective: There are a lot of dents on the surface,which usually wear on the middle finger,this adjustable thimble can protect the finger when the needle is over the cloth,and can exert force well to penetrate clothes. Description: This vintage metal open-sided copper thimble perfect for long fingernails. He can provide full protection,include the top,the Central so u don't need to buy the others thimbles and the quantity it's enough for one or two persone to use.(Always keep one for emergency) Specifications: Material: Brass Quantity: 3 pieces Size Approx:17 x 26 mm/0.68 x 1 inch Package includes: 3 x Finger protector thimbles Note: It's not advisable to adjust the size frequently because the material is copper.