A composition with a Mohs hardness of at least 6. An authentication system is provided for authenticating a user of a telephonic device that includes a setup system for capturing and storing an authentic user speech pattern sample; a comparison system that compares the authentic user speech pattern sample with an inputted speech pattern sample and generates a comparison result; and a control system for controlling access to the telephonic device. Proffering the biometric initiates verification of the biometric sample and facilitates authorization of a transaction. In some embodiments, the pressure sensor module may include a bag contact plate and the pressure sensor may measure a force exerted on the bag contact plate by the flexible container located between the bag contact plate and the squeeze plate. , t-butyl perbenzoate, and may further include at least one catalyst and at least one metal salt. When not in use, the position-limiting sleeves are pushed up to reveal the pivotal joints between the holder segment and the frame, and the holder segment can thus be folded down.