The Thomann t.akustik range of foam absorber tiles, are Thomann-branded, budget material.
The only specification given for the HiLo tiles, is their density; At 16,5kg/m3, the material is the lightest material I’ve found, which I believe cases poor performance. It is the cheapest material, though, and probably better than nothing.
They are available in different thickness, most of which are eggbox-shaped. The thickest are available as pyramids as well.
Their larger SA-N and SA-PA foam tiles have no specification at all, but I’ll guess they have the same density.