Good seal performance,suitable for PU sealant,Netural,Acetic Silicone sealant Specification:20L-A340: diameter 340mm,Hight 650mm,Thickness 123um,Seam 10mm20L-B286: diameter 286mm,Hight 650mm,Thickness 123mm.Seam 10mm200L-600 : diameter 600mm,Hight 1350mm,Thickness 123um,Seam 10mm aluminium foil bag