It is 0.50mm thick (0.020 inches). (I measured with digital calipers.) This is slightly thicker than a business card (300gsm or 0.014 inches.) - about the thickness of 5 sheets of paper.

Can I cut one of these silicone mats to have smaller mats?

Yes, I have in the past and buying these to do the same thing. Easy to cut with regular scissors

Is there fiberglass inside?

The contents say "silicone." They feel like silicone - very thin and flexible. I use mine under sensitive electronics to reduce the risk of static electricity. I think it would be safe to say that there is no fiberglass inside.

if I applied one or all of these to a paper towel holder rod would it keep the paper towel roll from spinning on the rod?

Haven't done it but wouldn't be surprised if it helped. Both sides of the sheets are quite non-slip. You would only need one (of the three), as they are large 12" x 16".

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3 Pack Silicone mat Large Silicone Sheets for Crafts, Liquid, Resin Jewelry Casting Molds Mat, Silicone Placemat 15.7” x 11.8” (Black & Gray & Beige)

Product ID: 283258587

Details

Brand
TDHDIKE
Color
Black & Gray &
Material
Silicone
Shape
Rectangular
Size
15.7 inches x

🎨Large 15.7” x 11.8” surface area

🔥Heat-resistant up to 446℉

🛡️Non-skid, durable silicone

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€ 25.26

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎨 Protect Your Craft, Elevate Your Space!

STAY PUT STABILITY - Non-skid silicone base ensures your mats stay firmly in place, giving you precision and confidence in every project.
CRAFT WITHOUT LIMITS - Generous A3 size mats catch every spill and splash, keeping your workspace pristine and your creativity flowing.
HEAT RESISTANT POWERHOUSE - Withstands temperatures from -20℉ to 446℉, perfect for oven, microwave, or resin curing without warping or damage.
EFFORTLESS CLEANUP STORAGE - Flexible, washable, and easy to roll or fold—these mats save you time and space, making craft sessions hassle-free.
VERSATILE CRAFTING ESSENTIAL - Ideal for resin, jewelry casting, baking, and more—these mats double as heat pads, coasters, and table protectors for the modern maker.

This 3-pack of large, high-quality silicone mats (15.7” x 11.8”) offers durable, heat-resistant, and non-skid surfaces ideal for resin crafts, jewelry casting, and kitchen use. Available in stylish black, gray, and beige, these flexible mats are easy to clean, store, and protect your workspace from spills and heat up to 446℉.

Specifications

ASIN	B08RD2J1NC
Best Sellers Rank	#988 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #220 in Craft Supplies
Brand Name	TDHDIKE
Color	Black & Gray & Beige
Customer Reviews	4.6 4.6 out of 5 stars (24,537)
Item Dimensions L x W	11.8"L x 15.7"W
Item Shape	Rectangular
Item Type Name	silicone mat
Manufacturer	TOPODO
Manufacturer Part Number	LE
Material Type	Silicone
Model Number	LE1
Size	15.7 inches x 11.8 inches
UPC	600358141464
Unit Count	3.0 Count

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