Andreas jar openers are made with silicone and fabric giving them a non-slip grip. One side rough, one side smooth for easy firm gripping. Andreas jar openers loosen the most stubborn jar lids by giving the user the most leverage possible due to the non-slip grip that fits comfortably into every hand. Best of all they stick to any smooth surface for easy storage, no more digging through drawers looking for jar openers. Stick on the refrigerator, even stainless steel, cabinets, microwave, windows, and more.