Hi Peter,
to IIS.
Your telescope is pretty much the same as mine except mine's an Orion.
The 9 and the 25 refer to the focal length of the eyepiece and I think the K means they are Kellner eyepieces.
This link has some good info regarding different types of eyepieces...
www.universetoday.com/guide-to-space/telescopes/telescope-eyepiece/
Haven't got time to go into more detail at the moment, but ask any questions you like and there will be plenty of responses from more learned members.
Hope this helps.
