Can you refill it with .5 or .7 ink? Is it a standard size?

Yes should work with Uni ballpoint refills (that have the plastic ring at the bottom)

Has anyone been able to open the transparent pen for a refill? I'm having a lot of difficulty.

I didn’t know you get could refills for this pen. I haven’t used it all but it’s getting close. I figured I would have to replace the entire pen.

Is this pen available in other ink colors?

Not this one specifically. However if you browse for similar products just by a different brand you'll find there are some that do have a variety in ink colors. However the most common are red black blue and green.

Manufacturer	Uni
Brand	三菱鉛筆
Item Weight	0.352 ounces
Item model number	SXE340038.66
Is Discontinued By Manufacturer	No
Color	Rose Pink
Grip Type	ergonomic
Pencil Lead Degree (Hardness)	HB
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Medium
Line Size	0_3mm
Ink Color	Black, Red, Blue
Manufacturer Part Number	SXE340038.66

Uni Ballpoint Pen Jetstream 3 Color Black, Red, Blue Ink 0.38mm, Rose Pink (SXE340038.66)

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