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cobbaleastone lso called pebbales, grvel; from the yellow sand in the wash out, nd she is kind of natural stone, stony hardnes

pebble is from 2500 years go because the earth's crust movementa, hidden in the sand in constant motion, she been genearated. she hs very high robustness, its performance: sio298.37%; fe2o30.04%; kg/cm2 790; s 0.02%; gardens, builadings, rods, goalf course construcation, sewge treatmenta, water treatmenta, river works.

specifications :0.8-1 .5 cm; 1-2cm; 2-4cm; 3-5cm; 4-6cm; 5-8cm; 8-15cm; 15-20cm