Are you talking about a Meade 6.3mm Plossl Eeda ? , if so yes these are a very good eyepiece , a little cramped in the eye relief but a very good eyepiece .
If you are talking about a 4mm Plossl , then its eye relief ( distance your eye has to be to see the image in the eyepiece ) is about 3 mm , very , very close , to close to be comfortable .
I would suggest a 2x Barlow so you get 25mm , 12.5mm 10mm and 5mm focal lengths as these would be fine in your scope .
One question , is your scope columated well ? because the 10mm is 120x if its an f6 and that's an easy magnification in your scope and the supplied 10mm eyepiece's are or good quality mostly and should give a good image .
Brian.