The high flexibility of filament means that it is a printing material whose key characteristic is high flexibility and elasticity. Prints made from this type of material behave similarly to rubber or silicone. They can be easily bent, squeezed or stretched, returning to their original shape when the pressure is released. This makes them fundamentally different from standard rigid filaments such as PLA or PETG, which are hard and will break if more bending is attempted. Because of this property, highly flexible filaments are used to make items that are intended to absorb shock, seal or simply be flexible. Typical examples are flexible phone cases, gaskets, model tyres, shoe soles or anti-vibration pads. This property is most commonly found in materials referred to as TPU, which is thermoplastic polyurethane, or TPE, which is thermoplastic elastomer. Printing with these materials itself requires specific printer settings, usually a lower print speed to avoid problems when feeding soft material into the print head.