Abstract: An outer peripheral coating member contains first particles containing titanium oxide, second particles containing zirconium oxide, third particles containing niobium oxide or aluminum oxide, and a dispersion medium. It is preferable for the first particles to have at least two peak values R1 in a distribution of particle sizes of the first particles. One of the peak values R1 is within a range of 1 to 50 nm, and the other peak value R1 is within a range of 100 to 500 nm.

Abstract: An outer peripheral coating member contains first particles containing titanium oxide, second particles containing zirconium oxide, third particles containing niobium oxide or aluminum oxide, and a dispersion medium. It is preferable for the first particles to have at least two peak values R1 in a distribution of particle sizes of the first particles. One of the peak values R1 is within a range of 1 to 50 nm, and the other peak value R1 is within a range of 100 to 500 nm.

Abstract: An auditory playing device has a plurality of circular or polygonal tone plates marked with respective identification codes. Each of the tone plates has concentric dark and bright stripes that are placed, one at a time, in a recess defined in a casing substantially in any direction with respect to the recess. The casing houses an array of detectors disposed in the recess for detecting the identification code on the tone plate that is placed in the recess. A microcomputer determines whether a tone plate is placed in the recess based on signals from the detectors. When one of the tone plates is placed in the recess, the microcomputer controls a loudspeaker to produce a sound represented by the identification code on the tone plate placed in the recess. The auditory playing device can easily be handled by children and is effective to train them for sharpening their auditory senses.