The Lacerta Dielectric Zenith Mirror is precision-machined glass material with a coating that promises 99% reflection (conventional aluminium coatings reflect 88% of light in total!) Dielectric coatings have numerous advantages over conventional ones: they do not age over time, meaning they retain their reflectivity over time. The coating is much harder, so it won't scratch during cleaning. Last but not least, it scatters less light than aluminium coatings and the resulting image is more contrasty, which is an advantage especially for planetary and binary star observations.
The body of the music mirror is made of aluminium, as opposed to the plastic housing of cheaper music mirrors. The interior is matte black, coated with a light-absorbing material, and has a recessed design for minimal glare.
The unique attention to detail doesn't end there: the music mirror has a brass clamping ring, so it won't scratch the focuser when attached. The eyepiece mounting screw is also larger than average, which is particularly useful when gripping through gloves in the cold of winter. The focuser is of course equipped with an anti-fall-out solution, as is a 1.25" filter thread as standard.