This is the original Suzuki recommended copper based grease to apply to the edges of the pads (so that they can move within the caliper). You only use a very small amount on each pad. Some people also apply it to the rear of pad between the pad and piston. It is mislabelled in some of the Suzuki parts books (and mixed up with the silicon based caliper axle grease). It is expensive for the amount of grease (a small 20g pot) but should last a long (life) time if only used for this purpose. I guess there is an argument that you could use a generic "copaslip" copper based grease instead. Its your decision.