12Pcs Kratky Blackout Sleeves Ball Mason Jars Hydroponic Container Sheath

Features:
Are sufficient for you to use in daily hydroponic system or replace.
Hydroponic jar sleeves allow you control light for different sprout seeds. It can keep light out of your container when hydroponic use, and most green leafy sprouts also prefer indirect sunlight.
Fit 10cm wide mouth mason jars quite well, it's not suggest to use on other size of mason jars.
Its very easy to use, you can only put the mason jar into the sleeve ,then tighten the adjustable buckle.

Specifications:
Material: Non woven fabric
Size: As the photo shows

Note:
Package does not contain hydroponic jar
Other items in the pictures are not included.
Different displays show the same picture may be slightly differences.

What's in the box
1xMason Jar Grow Cover