Do you apply these under, over or both?

I think applying both is overkill and create “too much” a filter situation. One os plenty and usually on the outside. But i do not know your intended use. But again one is plenty and on the outside

Will they cover 2 in hole?

Our stickers are only 2cm and can't cover 2 inches.

what is the material?

No idea. But its breathable. Seems like a poly.

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Zonon 128 Pieces Synthetic Filter Paper Stickers 20 mm 0.3 μm Filter Disc Mushroom Applied Under Wide Mouth Jar Lid for Mushroom Cultivation

Zonon 128 Pieces Synthetic Filter Paper Stickers 20 mm 0.3 μm Filter Disc Mushroom Applied Under Wide Mouth Jar Lid for Mushroom Cultivation

Product ID: 289999655

🌀0.3 μm ultra-fine filtration

🔥Heat & pressure resistant

🌬️Breathable air circulation

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54251CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍄 Cultivate with confidence—filter your way to fungal perfection!

OPTIMIZED AIRFLOW - Breathable synthetic material ensures fresh air exchange, promoting robust mushroom growth.
PERFECT FIT DESIGN - 20 mm diameter discs tailored for wide mouth jar lids for seamless application.
PRECISION FILTRATION - Filters particles as small as 0.3 microns to keep your mushroom culture pure.
BULK PACK CONVENIENCE - 128 pieces provide ample supply for continuous cultivation cycles—never run out.
AUTOCLAVE READY DURABILITY - Withstands high heat and pressure for sterilization without compromise.

Zonon’s 128-piece synthetic filter paper stickers are engineered for mushroom cultivation, featuring 20 mm diameter discs with 0.3 μm filtration. Their heat- and pressure-resistant design makes them autoclave-safe, while breathable material ensures optimal air circulation under wide mouth jar lids, fostering healthy mushroom growth.

Specifications

ASIN	B08P1T1Z1S
Best Sellers Rank	#357,580 in Kitchen ( See Top 100 in Kitchen ) #675 in Canning Lids
Brand	Zonon
Customer Reviews	4.7 4.7 out of 5 stars (606)
Date First Available	23 January 2021
Item Weight	18.1 g
Manufacturer	Zonon
Manufacturer Part Number	Zonon-37585
Material Type	Synthetic
Model number	Zonon-37585
Package Dimensions	21.64 x 11.4 x 0.99 cm; 18.14 g

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