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 Large Silicone Sheets for Crafts, Liquid, Resin Jewelry Casting Molds Mat, Multi-Purpose Food Grade Silicone Placemat. Black & Gray & Beige (15.7 x 11.8 inch)

3 Pack Large Silicone Sheets for Crafts, Liquid, Resin Jewelry Casting Molds Mat, Multi-Purpose Food Grade Silicone Placemat. Black & Gray & Beige (15.7 x 11.8 inch)

Product ID: 366604445

Details

Brand
TDHDIKE
Manufacturer
TOPODO
Product dimensions
39.9L x 30W
Shape
Rectangular
UPC
600358141464

🎨Multi-purpose for crafts & kitchen

🔥Heat resistant -20℉ to 446℉

🛡️Non-skid & waterproof surface

Description

🖤 Elevate your craft and kitchen game with silicone sheets that work as hard as you do!

MESS FREE MASTERY - Non-stick, waterproof, and easy to clean—say goodbye to stubborn stains and spills.
FLEXIBLE FOLDABLE - Lightweight silicone sheets that roll or fold for effortless storage and portability.
CRAFT CULINARY READY - Perfect for resin casting, jewelry making, baking, or as stylish heat-insulated placemats.
TRIPLE TONE VERSATILITY - Three large mats in black, gray & beige to match any workspace or kitchen vibe.
HEAT RESISTANT POWERHOUSE - Withstands extreme temps from -20℉ to 446℉—oven, microwave, fridge ready.

This 3-pack of large, food-grade silicone sheets (15.7 x 11.8 inches) offers durable, heat-resistant, and non-skid surfaces ideal for crafts, resin jewelry casting, and kitchen use. Made from high-quality, odorless silicone, these mats are flexible, easy to clean, and withstand temperatures from -20℉ to 446℉, making them versatile tools for both professional and home environments.

Specifications

ASIN	B08RD2J1NC
Best Sellers Rank	3,005,814 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 2,582 in Baking Mats
Brand Name	TDHDIKE
Customer Reviews	4.5 4.5 out of 5 stars (1,229)
Item Dimensions L x W	39.9L x 30W centimetres
Item Shape	Rectangular
Manufacturer	TOPODO
Manufacturer Part Number	LE
Model Number	LE1
UPC	600358141464

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