Fiskars Scissors: PowerArc™: Heavy Duty: 21cmThe heavy duty scissors are ideal for cutting a range of materials, including insulation, duct tape, cardboard, rope, tar paper, Tyvek, hose and more PowerArc patent pending technology boasts curved blades that alter the angle between blades to give you over 30% more power, especially during the toughest part of the cut Heavy duty coined stainless steel blades power through thick materials without separation and wont rust Serrated edge grips slippery