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)

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 for mess-free crafting

🔥Heat resistant up to 446℉

🛡️Non-skid & tear-resistant durability

COP 84218

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎨 Elevate your craft game with mess-free, heat-proof silicone mats — because your creativity deserves the best!

STAY PUT STAY FOCUSED - Non-skid silicone ensures your projects stay exactly where you want them—no slips, no stress.
HEAT RESISTANT POWERHOUSE - Withstands temperatures from -20℉ to 446℉, perfect for oven, microwave, or resin curing.
CRAFT LIKE A PRO MESS FREE - Generous A3-sized mats catch spills and protect your workspace with style.
VIBRANT TRIO FOR EVERY MOOD - Black, gray, and beige mats add a sleek, modern vibe to your creative zone and daily routine.
EASY CLEAN COMPACT STORAGE - Flexible, washable mats roll or fold effortlessly, saving space and time for your next masterpiece.

This 3-pack of large silicone mats (15.7” x 11.8”) offers durable, non-skid, and heat-resistant surfaces ideal for resin casting, jewelry making, and various DIY crafts. Featuring three stylish colors—black, gray, and beige—these mats protect your workspace from spills and heat up to 446℉, while being easy to clean and store. A must-have for professional and hobbyist crafters seeking efficiency and style.

Specifications

ASIN	B08RD2J1NC
Best Sellers Rank	#1,804 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #371 in Craft Supplies
Brand Name	TDHDIKE
Color	Black & Gray & Beige
Customer Reviews	4.6 4.6 out of 5 stars (24,606)
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 Count

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COP 84218

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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