the most popular stone decor lastly. It is Split face surface. Travertine Split Face has a rough surface and usually comes in 4 different sizes: 10 x 10 cm and 10 x 15 cm and 10 x 20 cm and 10 x 30 cm. So, We call 10 x free split face. Besides, 7,5 x free cm and 5 x free cm are popular for inside projects too.Split face is usually as thick as travertine pavers (3 cm) and the real thickness after split face 2,1 cm for 10 xfree. the main usage of split face is for walls. Splitface can be used indoors and outdoors. Some interior designers prefer to apply a split face layer in between wall tiles to create additional contrast.