Rigid casings will make the antenna more solid and rubber ones will allow it to stretch like an elastic band.
刚性的外壳会使这种天线更坚固，橡胶外皮可以让它像橡皮筋一样伸展。
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The stylish, confident design is mirrored in solid materials like stainless steel, scratch-resistant glass and silicone rubber keypad - not to mention the fine leather case.