What's the difference between the 35mm and 50mm?. Picture show same width.

35mm is relatively narrower and 50mm is relatively wider. The width of both of them is not the same.

What is thickness of weatherstripping

Hello: The thickness of the adhesive part is 0.7mm, and the thickness of the sealing part is 0.5mm.

Silicone portion of the tape does not seal or stick and remains loose so this does NOT create an "airtight" seal at all, right?

Hello, there is adhesive on one end of the tape and no adhesive on the other end. You need to stick it along the edge of the gap, which can easily block the cold or hot air in the gap, and also make it very convenient for you to open doors and windows at any time. Hope my answer can help you.

I read that its adhesion is not very good and a double sided tape can help. Is Scotch's double sided tape sticky enough? Or heavy duty?

I have had no trouble with mine sticky on the door and window sill. I would be afraid to use double stick tape because it will come loose then When you put in on press down and slide your finger over it to seal it tight. Make sure not to touch the sticky . good luck I love it has saved me lots of money.

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🚪 Seal the deal on comfort and style—because your home deserves the best!

UNYIELDING ADHESION - Premium self-adhesive silicone backing ensures a firm, durable hold even in extreme weather.
INVISIBLE PROTECTION - Ultra-thin, transparent silicone strip blends seamlessly with doors and windows—no eyesores here.
MULTI FUNCTIONAL BARRIER - Blocks wind, dust, noise, and pesky insects for a quieter, cleaner, and more comfortable home.
EFFORTLESS DIY INSTALLATION - Peel, stick, and compress—no tools needed, with tips for optimal adhesion in any climate.
PRECISION FIT FOR EVERY GAP - Two size options (25mm & 45mm) to perfectly seal gaps up to 30mm wide.

This self-adhesive silicone door strip offers a sleek, transparent weatherproof seal for gaps up to 30mm, combining high-strength adhesive with durable, flexible silicone. Designed to block drafts, noise, dust, and insects, it’s an easy-to-install upgrade that enhances home comfort and energy efficiency without compromising aesthetics.

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Manufacturer	FENGLE
Product Dimensions	502.92 x 4.5 x 0.1 cm; 1.25 kg
Item model number	Silicone Seal Strip
Size	45MM Transparent
Colour	Transparent
Material	Silicone
Batteries included?	No
Batteries Required?	No
Item Weight	1.25 kg

Self Adhesive Door Strip Bottom, Weather Stripping for Door or Window,Weatherproof Soundproof Silicone Seal Strip,Slim Insect Proof Seal for Gap of House or Shower Door

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