Hello! This listing is for one (1) new brake rotor, and one (1) new set of brake pads for 10k-HD and 12k Dexter trailer axles. Our new caliper comes with the four (4) new O-rings inside the slide housing on caliper. We also stock new disc brake pad sets, wheel seals, bearings and rotors too! We are here to help and are knowledgeable of these parts. Feel free to send us pictures of what you are looking for so we can help you be sure it is all correct! We offer free shipping, free returns, and no restocking fee!  However, if you choose not to keep the item, we will be happy to refund you upon receipt of the unused/uninstalled product, but we will deduct the cost of the initial shipping.