Tiny protrusions on the outer side of the inner case reduce surface contact with the metal bezel. This reflects the design philosophy for the hollow case structure, which protects the module through point contacts and absorbs external shocks. To increase strength, fiberglass is incorporated into the resin. The material's resistance to impact-related breaks and bends protects the module from external shocks. This case offers excellent shock resistance. The bezel is forged in about 20 work steps, then cut and polished. It is meticulously crafted from a complex, very uneven casting, so the shape of the back may affect the fit of the inner case. The surface is polished to a high gloss and finely sanded. The iconic button on the front of the 6900 has moved beyond its purely functional role in controlling the backlighting and receives a metallic makeover. It is precisely designed, balancing the protective features of the buttons, and has a shape and angle that are easy to press. The triple-graph dials harmonize excellently with the LCD display and the front panel, whose high-gloss surface complements the metal case, creating complete design harmony.