Review on Amazon Basics Rubber Sanding Block: Essential Tool for Smoother Surfaces by Marvin Breezy

The basic design is the same as you're familiar with: the top flaps of the tail lift to reveal 3 spikes that hold the sandpaper to wrap same piece at the other end. The innovation is that they include grooved sections that work like hinges to give the top flaps a little more flexibility when lifted to change sandpaper. The strength of the petals holding the ends of the sandpaper is not greatly reduced. The hinges seem to help a little. Below is the sandpaper surface design like a honeycomb. I don't know what's the use yet. Maybe to disperse the dust? I will update after further use if needed. The overall size is slightly smaller than the block I used, but that's not a problem. This is a quality unit that works the way you want it to.