Trolley fabric how to distinguish

Trolley fabric variety, then, different fabrics Trolley Case how to choose?
A lot of bags of fabric will choose to use leather, leather bags and the most important thing is the quality. To identify the authenticity of leather goods, we must learn the sensory evaluation method, its essence is by hand touch, seeing, bending, stretching and other methods to observe the characteristics of leather goods.
First, buffalo skin: more yellow leather pores, skin fibers are also slightly thicker.
Second, yellow leather: fine texture expected, the pores were irregular points arranged.
Third, goatskin: pattern was wavy arrangement, coarse and detailed, stout firmer than sheep, light.
Four, pigskin: The surface pattern is usually a set of three pores distribution, the surface is rough, can be soft or hard.
Fifth, the natural leather: There will be fine lines squeezed with thumbs, cortex leather surface better plump, good elasticity; and cortical leather have larger wrinkles; if there is no fine lines, it is not natural Leather.
Fifth, sheepskin: pattern was half-moon arrangement, softness, fur is dense, thin skin.