The corners are cut to prevent leakage, making them less likely to peel off and easy to use. Please give them a try! They're about a third of the price of commercially available products! Air-Walls are quite expensive to buy. Why not start with a 10-sheet trial? (*´꒳`*) 10 sheets: 400 yen 20 sheets: 750 yen Up to 20 sheets will be shipped via regular mail. 30 sheets: 1100 yen 40 sheets: 1400 yen 50 sheets: 1600 yen #Hollister #Coloplast #Dansac #Alcare #StomaSupplies #GentleOnSkinPouch #TRE #StomaSupplies