These Straight Cobaltima® micro fine pointed tweezers are ideal for high magnification microscopy (the best of the best). They are made of a cobalt alloy, which is extremely hard, temperature resistant to 932°F (500°C) and corrosion resistant. The body is .04"(1mm) in thickness for light pressure use. The tips are radius which eliminates marring and scratching of delicate parts and wires. The handles are serrated for more control.