Product Name: cobblestone ground warm stone filter material water wash stone pebbles gravel specification size: 0.8-1.2cm (and other dimensions, need to contact customer service) material ratio: cement: yellow sand: the weight ratio of bean stone is roughly 1:2-3:3 because the ground small area leveling no vibrating bar vibrator board, so yellow sand is not easy too little. Otherwise, there will be a lot of void in the solidified soil.