Could it fit a 16 oz mason jar?

They will if you use an adhesive or tape to adhere to inside lid or it will come off every time.

Are these sterilized or do you recommend we spray them with isopropyl alcohol to disinfect before using?

As a customer that has use this product I do sterilize mine because they are not sterile when they arrive. I do use the 70% alcohol isopropyl and spray them and let them dry for at least three minutes. I use sterile technique to apply those to my products and they work fantastically. I hope this helps!

Will these for on a 17oz plastic spice jar? And what about an 8oz spice jar?

If the opening is about 2.75 inches, it might. You would have to find out what the opening size of the spice jar is. Contact the manufacturer if it is not stated on the packaging.

Will this fit for 1.8 jars? If not, which size would I need?

You should measure your jar best way to be safe.

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70 mm Foam Lid Liner Pressure Sensitive Seal Round Jar Sealer Bottle Seals Heat Resistant Cap Torque Activated Safety for Protection Jar Cap Bottle Vial Tamper Gasket Kit (200 Pieces)

70 mm Foam Lid Liner Pressure Sensitive Seal Round Jar Sealer Bottle Seals Heat Resistant Cap Torque Activated Safety for Protection Jar Cap Bottle Vial Tamper Gasket Kit (200 Pieces)

Product ID: 456736377

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Details

Material
Polystyrene
Colour
white
Brand
Tondiamo
Style
Compact
Item weight
0.09 Kilograms

📏70 mm diameter fits most bottles

🔥Heat resistant for reliable protection

🛡️Torque-activated adhesive for secure seal

Description

🔒 Seal smart, stay fresh—because your jars deserve the best!

VERSATILE PROTECTION - Compatible with glass, plastic, jars, pots, cans, and more for all your sealing needs.
UNIVERSAL FIT ZERO HASSLE - 70 mm diameter seals fit a wide range of jars and bottles effortlessly.
BULK PACK FOR PROFESSIONALS - 200-piece kit ensures you’re always stocked for packaging, preserving, or shipping.
BARRIER AGAINST THE ELEMENTS - Airtight and leak-resistant design locks out dust, moisture, and odors.
SEAL IT TIGHT KEEP IT FRESH - Pressure-sensitive adhesive activates with simple tightening—no machines needed.

This 200-piece set of 70 mm foam lid liners features torque-activated, pressure-sensitive adhesive seals that provide airtight, leak-resistant protection for a variety of round-neck containers. Heat resistant and easy to apply without special tools, these liners keep contents fresh by preventing dust, moisture, and odors from entering.

Specifications

Manufacturer	Tondiamo
Item Weight	91 g
Package Dimensions	14.3 x 8.31 x 8.2 cm; 91 g
Item model number	Tondiamo-Liner Pressure-645
Color	white
Style	Compact
Material	Polystyrene
Shape	Round
Item Package Quantity	1
Number Of Pieces	200
Special Features	Airtight, Leak Resistant
Batteries Included?	No
Batteries Required?	No

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