Description Do you need a mason jar sleeve for hydroponic planting use? Are you looking for some practical and convenient blackout mason jar sleeves? If yes, you should have a look at our products. Made of premium polyester material, these Mason jar blackout sleeves are durable, not easy to tear, easy to clean and reusable. They are in black, which can keep light out of your container when hydroponic use Features -Color:Black -Material:Polyester -Size:16.50X9.00X9.00cm/6.48X3.54X3.54in -Made of premium polyester material, these Mason jar blackout sleeves are durable, not easy to tear, easy to clean and reusable. -This package includes enough blackout sleeves, which are sufficient for you to use and replace in daily hydroponic process. -Our hydroponic jar sleeves are black, which can keep the light out of your container when hydroponic use -The mason jar blackout sleeves fit most wide-mouth mason jars and other jars of proper size. -The sleeve is very easy to use, you can only put the mason jar into the sleeve, then tighten the adjustable buckle on the drawstring.Package list: 12 Blackout Sleeves for Mason Jars