FLEX Rocky Black

The firm elastomer gives way more resistance than I expected, which made the suction feel way stronger. Took me a minute to get the hang of pushing through it, but once I did the spiraling ribs really did their job.

The firm elastomer really does push back as you go deeper, and that resistance is exactly what makes it feel so good. The spiraling ribs hit consistently every time.

The firm elastomer really does put up more resistance than I expected, and that spiraling rib texture hits differently once you push through it. That suction builds up nicely the deeper you go. Takes a bit more effort than softer ones, but that's exactly what I wanted.