"Celestron 10" and "20" eyepieces

I bought a Celestron 102 spotting scope to use as a portable guide scope for piggy back photography (works great by the way). Along with the scope came two eyepieces labeled on the side with bold letters 'Celetron 10' and 'Celestron 20.' They seem to give reasonable views, but obviously not up to my TeleVue Plossls. I don't need these eyepieces, but wanted to pass them along via Astromart if they are worth passing along. Anyone know anything about these eyepieces and a reasonable value?
Thanks, Ed

POSSIBLY(?), just basic generic eyepieces and the 10 and 20 refer to the approximate magnification when used with the telescope they were designed to be sold with.

FWIW,
bill