Essential for automobile and small engine repairs. Copper washers are often used inside piping, electronics, family products and bio applications, as copper is malleable and ductile- a biostatic floor that could be a good warmth conductor and, if very pure, a good electric conductor. Copper Provides a denser seal and larger heat endurance than steel and rubber washers. Product name: Copper washer Total size: 10 x 14 x 1 mm / 0.4 inches x 0.55 inches x 0.04 inches (inside Ø * of * T) Material: copper Color: copper base shade Net weight: 13g Package Contents: 20 x copper washing machine Only the above kit content, different merchandise will not be included. Note: Light shooting and assorted displays could cause the color of the item in the photo a little assorted from the real thing. The size allowed error is +/- 1-3cm.