Seller notes

Description:Walnut sand shell is a pure natural polish material, its hardness was lower than metal but higher than carbon deposition,it will clean intake pipe and back side of intake valve thoroughly but no damage.A large amount of pores on surface of walnut sand which provide super adsorption capacity, non-toxic and corrosion preventive. As a pure, natural polishing material, walnut sand boasts a hardness level that falls between that of metals and carbon deposits. This unique characteristic al...

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