Quickly received as specified. Plastic rigid appearance but with some flexibility. Fits perfectly on the waterproof case with my GoPro Hero3 + by slipping a slight traction on the perimeter shapes to marry. Besides, I do not understand the comment that denigrates this, and fortunately I followed other opinion because I'm very satisfied for now. There is no registration GOPRO above but somehow it was not specified. Given the price / quality ratio, I definitely recommend for housing GoPro Hero3 + anyway.