is the "7 set" seven packs of four or seven in one package?

Thank you for your question. I don't sell 7 sets, but 1 set contains 4

Do these create a lot of tiny bits of eraser dust? Or does the dust roll on itself to create long pieces?

It does not create dust but rolls on itself to create longer pieces. I love this eraser! It’s also nice because you can make a point out of it.

Will this work with Factis BM2?

I'm guessing that's a pencil style eraser and can't tell you if that's going to fit. Either see factis or buy the tombow mono one, which is a great eraser.

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Tombow 82052 MONO Knock Eraser Refills, 4-Pack. MONO Knock Eraser Pen-Style Refills in a Convenient Value Pack

Product ID: 4292033

Details

Brand
Tombow
Color
Multicolor
Material
Plastic
Product Dimensions
5.5"L x 1.3"W
Recommended Uses For Product
Drawing

📦4-pack value set

✏️3.8mm precision fit

🖊️Pen-style refill design

Description

🖊️ Erase mistakes like a pro—because your ideas deserve a flawless finish.

VERSATILE USE CASES - Ideal for executives, artists, and managers who demand clean, sharp documents.
VALUE PACKED QUAD SET - Four refills in one pack—never run out mid-project or meeting.
LIGHTWEIGHT PORTABLE - Carry professional-grade erasing power without the bulk.
PRECISION 3 8 MM DIAMETER - Fits perfectly in Mono Knock & Aristo DK2 pens for flawless erasing.
PEN STYLE REFILL CONVENIENCE - Sleek, easy-to-insert refills keep your eraser pen ready for action.

Tombow 82052 MONO Knock Eraser Refills come in a convenient 4-pack, designed with a precise 3.8mm diameter to fit Mono Knock and Aristo DK2 pen-style erasers. Lightweight and easy to insert, these refills ensure smooth, clean erasing for professional documents, creative projects, and everyday office use.

Specifications

ASIN	B000IGTTXA
Additional Features	Lightweight
Best Sellers Rank	#303,158 in Office Products ( See Top 100 in Office Products ) #133 in Mechanical Pencil Eraser Refills
Brand Name	Tombow
Color	Multicolor
Customer Reviews	4.8 4.8 out of 5 stars (542)
Global Trade Identification Number	04901991650389
Item Dimensions L x W	5.5"L x 1.3"W
Item Shape	Pen
Item Weight	9.07 g
Manufacturer	Tombow
Material Type	Plastic
Model Name	Tombow
Number of Pieces	4
Recommended Uses For Product	Drawing
Unit Count	4 Count
Warranty Description	No Warranty

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