Essential for automotive and small engine repairs.Copper washers are often used within piping, electronics, household products and bio applications, as copper is malleable and ductile- a biostatic surface that is a good heat conductor and, if very pure, a good electrical conductor.Copper Provides a denser seal and greater heat endurance than steel and rubber washers.Product name: Copper washerTotal size: 10 x 14 x 1 mm / 0.4 inches x 0.55 inches x 0.04 inches (inside * of * T)Material: copperColor: copper base colorNet weight: 13gPackage Contents:20 x copper washerOnly the above package content, other products are not included.Note: Light 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.