size:18",19",20",21" Gram:10gsm,12gsm Color:white,blue,etc Type:Single,Double Packing:100pcs/polybag,1000pcs/case 1.antistatic 2.Used in industrial 3.It can be extend and shrink.Easy folded style offers you cost-saving. 4.Various size and colors are avaiable 5.Soft,thermally bonded polypropylene with welded elastic around the edge. 6.Single/Double elastic band 7.Breathable nonwoven fabric assure long-wearing comfortable. 8.customers' logos can be printed on