Billini Heels Universal Store Billini Cattie Heel Black Billini Heels Universal Store Billini Heels Universal Store Billini Heels Universal Store. Cattie by Billini is a statement block heel mule. This effortlessly strappy mule is a style staple for all year round dressing. Featuring; high shaved block heel open square toe tubular multi strap upper easy slip on design open heel counter synthetic upper, lining and outsole Available in Black and Bone. Heel height 10cm.