synthetic filter discs(filter disk): can be used within a pressure cooker, steam sterilizer or autoclave
filter disc (filter disk 70mm)are reusable, highly durable and have a filtration rate of 99.97% that means they will filter down to .3 microns.
planting discs fit precisely on any Regular Mouth 70mm canning jar which are commonly used by today's cultivators
24 Synthetic Filter Discs 70mm Superior to Tyvek filter discs "regular mouth" Size Used for Mushroom Cultivation
designed for 70mm wide mouth jar lids, you can also DIY them into regular mouth size or any other smaller sizes

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