What kind of tiles is less slippery?

The slip resistance and the level of safety of porcelain stoneware are determined by the classifications R and A + B + C. The least slippery are structured and grip finishes, and they have a value R> 11. Porcelain stoneware with these types of finishes are recommended for exteriors such as balconies, walkways, parking, barbecue area, swimming pool and landscape design. Matte or natural finishes, as a rule, have a value R9, and can be used for interiors, except the places with an elevated water content. Glossy finishes can be used only for interiors, except the places with an elevated water content, and are not recommended for use in gaming areas as a floor covering.