Are there any type of chemicals embedded in the magicfiber cloths to help them clean? Or is it just a really well constructed microfiber cloth?

I don't believe there are any chemicals in the magicfiber cloths, rather just really well constructed cloth, as you suggested. With your question, however, I've sniffed the cloths and smell nothing and I've also washed some a time or two and their effectiveness hasn't been compromised. I will admit that when we use the cloth for cleaning our eyeglasses, if they're quit dusty/greasy/whatever, it's obviously best to at least rinse them first as anything you use to rub on the glasses can scratch them. For ordinary daily use and as wipes for computer monitor, tv screen, cell phone, etc., they work great and I see no sign of a chemical residue on the glass. But be sure to hand wash in warm water and air dry as the packaging states...which takes only a minute, and just lay on a paper towel to dry. The packaging does also state that the magicfiber cloths are good for drying wine glasses and other fine crystal...which would also indicate to me that there are no chemicals in the cloth because one would obviously be drinking or eating out of these items. Another great thing about these larger cloths is that you can leave them their original size or cut them to any handy size you want. My husband and I've found that often microfiber cloths for cleaning are just not quite big enough for particular tasks. I hope this answers your question, and then some.

are they good for eye glasses?

We use them to clean our eyeglasses at least once a day with good results. Once in a while rinse them out to remove the built up dirt.

What are the dimensions of the extra large cloth?

If you place your cursor over the extra large pack it has a picture of the regular and extra large cloths. The extra large are 16" x 16" and you get three cloths in a package.

ASIN	B0043WJRRS
Audio Recording	No
Best Sellers Rank	#1,125,893 in Electronics ( See Top 100 in Electronics ) #158 in Camera & Photo Cleaning Cloths
Brand	MagicFiber
Brand Name	MagicFiber
Brush Length	6 Inches
Compatible Devices	Any device with a screen or lens
Enclosure Material	Microfibre
Material	Microfibre
UPC	609465150536
Unit Count	30.0 Count
Water Resistance Level	Water Resistant

(30 Pack) MagicFiber® Premium Microfiber Cleaning Cloths - For Tablet, Cell Phone, Laptop, LCD TV Screens and Any Other Delicate Surface (29 Black, 1 Grey)

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