I'm confused by the numbers attached to each file. What do the numbers mean?

They refer to the size of the grit, or the roughness. So for fingernails you'd want a very small number, a fine grit, like 1 or 2. For calluses on the hands, probably #5, but calluses on feet need an even rougher texture, such as #11.

what is the diamond particle size (microns) on the coarce and medium?

The only info I can see is #11. But, I do love this. It works very well without being too abrasive.

What is the handle made of? Can these be sterilized or autoclaved?

the foot buffer is a high quality plastic but the handle is wrapped with a flexible and "grippable" cover. I would not recommend autoclaving or sterilizing. I clean mine with hot water on the buffer side only. It is very easy to clean in this manner.

ASIN	B000ALDJ7A
ASIN	B000ALDJ7A
Best Sellers Rank	#106,862 in Beauty ( See Top 100 in Beauty ) #368 in Nail Files & Buffers
Customer Reviews	4.7 4.7 out of 5 stars (429)
Customer reviews	4.7 4.7 out of 5 stars (429)
Date First Available	7 August 2012
Department	womens
Global Trade Identification Number	00628411111001, 00628411111018
Is Discontinued By Manufacturer	No
Is electric	No
Item form	Filer
Item model number	1403-00708
Manufacturer	Diamancel
Manufacturer	Diamancel
Number of Items	1
Product Dimensions	25.2 x 7.1 x 0.3 cm; 79.38 g
Style	Classic
UPC	701480617442 885128981970 628411111001 885263430562 524883337133 885152209712 628411111018 885123292323 885204552162 885498866914 885147713170 885574173448 883142180140 885385162631 887421157618
Unit count	1 Count
Weight	81 Grams

Luxury Diamond Foot Buffer 11 Medium Grit Rasp For Average Calluses, Rough Skin & Regular Maintenance, 1 Count (Pack of 1)

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