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Recently, the Bahtinov-style mask has overtaken the Hartmann mask in popularity for the reason that the Bahtinov diffraction pattern's unique display provides a more accurate guide to determining the optimum focus point.

Made from lightweight .062 aluminum. Tall design blocks glare from the sun and off the observer's face. Both sides now painted high gloss white.
Holds three 1-1/4 eyepieces, PST lens cap & PST diagonal plug.
Rubber eyepiece holders prevent eyepieces from falling out when viewing the sun at higher altitudes. Will not block the built-in solar finder.

Made from light weight breathable black fabric.
Elastic bands ensure a good fit. Helps to stops dust getting onto your secondary mirror.