Natural gravel

Natural Gravel Bairaman 0.1 – 0.6 mm

Natural Gravel Kongo 10 – 30 mm

Natural Gravel Kongo 3 – 8 mm

Natural Gravel Mekong 0.1 – 1.4 mm

Natural Gravel Okavango 4 – 8 mm

Natural Gravel Okavango 8 – 12 mm

Natural Gravel Rio Branco 0.1 – 2 mm

Natural Gravel Rio Xingu 2 – 22 mm