I just received an E-mail on these today:
------"It features an innovative wave design that is not only visually appealing but in tests actually improves the sound quality of the speakers. It has also been designed to be direct mounted on top of the speaker with a simple twist (no more silicone to keep the grill on) and includes stainless steel Allen head hardware for speaker mounting. It also features a Hydrophobic micro-mesh inside that repels water mist and dust but has no effect on sound quality. The white finish has been UV treated and will not yellow. The grill is lined with waterproof sound damping material to improve sound quality and absorb vibration"------