A chamfering apparatus for chamfering an outer periphery of a disk-shaped substrate includes a grinding member having a circular hole inside thereof, wherein the hole has a diameter larger than an outer diameter of the substrate. In one exemplary embodiment, an implant is provided having an anterior portion that is adapted to be positioned between adjacent vertebrae and a posterior portion that is adapted to be positioned around a spinal cord and to couple to a posterior surface of at least one adjacent vertebra. Also using a sound reflector and angled air tunnel on whistle with opening on top can be used to make sound waves go forward. A plurality of bottom edge rails having a uniform, consistent cross-section is connected between a sidewall and the base. In yet other embodiments other types of devices can be used. More particularly, the present invention relates to the use of inorganic filler materials of a defined type and particle size which can be added to curable organic coatings to improve the scratch resistance of the coating without a negative impact on the physical and performance properties or application parameters of the original coating material.