Other products may also contain design features meant to frustrate repairs, such as Apple's "tamper-resistant" pentalobe screws that cannot easily be removed with common consumer tools.[14] Front loading washing machines often have the drum bearing - a critical and wear-prone mechanical component - permanently molded into the wash tub, or even have a sealed outer tub, making it impossible to renew the bearings without replacing the entire tub. The cost of this repair may exceed the residual value of the appliance, forcing it to be scrapped.[15]