Tony Bianco Caya Mule in Metallic Silver. - size 10 (also in ) Tony Bianco Caya Mule in Metallic Silver. - size 10 (also in ) Metallic leather upper with man made sole. Slip-on styling. Fringed tassel accents. Heel measures approx 3.5 H. TONR-WZ70. CAYA. Based out of Australia, the Tony Bianco brand embraces a mix of the contemporary, the classic, and the cool. Their signature can be seen in the use of high quality materials and a keen eye for detail that is used to create on-trend pieces that will survive the test of time.