Depending upon how tame your gliders are you can also clip their claws provided you don't cut much off, just the tip, avoiding the red vein which runs through the nail (as if you clip this it will hurt them and bleed). If you do decide to clip, ensure that you don't take much off at all or they won't be able to climb well anymore.
I clip my boys as they're very docile and they don't seem to mind, it seems more effective than using the inserts (though I've never used a proper one...just sand paper) and as I scar super easily and take ages to heal, it's much better than looking like I have some awful skin disease
