These standard 1.25" eyepieces came with the 60mm refractor I got from Orion a while back, but I don't use them. There is a K 25mm and a K 10mm that come with the cases shown in the photo. They don't have additional labeling, but they sure look like the Orion Explorer II eyepieces that they sell for $27.95 each, plus shipping. They perform nicely, but probably have only 40-45 degree FOV, instead of the 50 advertised for the Explorer II. The barrel is metal, and threaded for filters, but inside is plastic, as I can see a "ripple" in the 10mm field stop. Of couse it does not affect the view. I will sell these for $19.00 each, and include first class shipping in the US by USPS.
Thanks for looking,