Does anyone know where to find eraser replacements for the pencil?

Since I have checked and was not able to find out the MUJI eraser replacements, I went to ask it to the sales person of the MUJI store near here in Tokyo. She has answered there is no eraser replacements for the MUJI mechanical pencils which MUJI has to prepare.

Isn't this a Pentel Graphgear 500?

Random side note, the Graph Gear 500 is available from .3 mm to .9 mm and maybe as a lead holder. The body colors let you know what size lead is in them if they're in a pencil cup or something.

What do the different letters on the cap mean( H, 2H, 3H)?

They indicate the hardness of the lead, personally I'm a fan of HB. You can change them yourself be rotating the cap to show whatever lead you chose to fill it with

ASIN	B00K2U47KM
Additional Features	Pocket Clip, Refillable
Age Range (Description)	Adult
Age Range Description	Adult
Amazon Bestseller	#14,708 in Office Products ( See Top 100 in Office Products ) #259 in Mechanical Pencils
Brand	MUJI
Brand Name	MUJI
Color	white
Customer Reviews	4.4 out of 5 stars 1,886 Your Review
Drill Point	Fine
Global Trade Identification Number	04548718360543
Grip Type	Knurled
Hand Orientation	Right
Hardness	HB
Included Components	Knurled, Display Window
Ink Base	Water
Ink Color	White
Item Diameter	0.5 Millimeters
Item Dimensions	14.7 x 1.1 x 0.9 cm
Item Type Name	Mechanical Pencil
Item Weight	9 g
Line Size	0.5 ミリメートル
Manufacturer	無印良品
Material	Plastic
Material Type	Plastic
Model Name	18360543
Model Number	18360543
Recommended Uses For Product	Coloring
UPC	799198915639 796825045684 787718124920
Unit Count	1 Count
Writing Instrument Form	メカニカルグラファイトペンシル

MUJI 18360543 Low Center of Gravity Mechanical Pencil, White, 0.4 x 0.4 x 5.8 inches (11 x 9 x 147 mm), Lead Diameter 0.02 inches (0.5 mm)

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