PERFECT FOR POP-UP TENTS AND GAZEBOS: Keeps them weighted down in heavy rain and wind.FITS SQUARE CANOPY POLES: Sized between 20 x 20mm and 40 x 40mm.FILLABLE: Can be easily taken with you on the go.SET OF FOUR: Keeps your tent and gazebo weighted in all corners.DURABLE PLASTIC: Ensures durability. DIMENSIONS: Each weight: 4kg when filled with sand, 5kg when filled with cement