Luke Onix Leather Ballet Flats from ALOHAS. Few styles are as classic as Mary Jane flats - it's no wonder that Luke has been a bestseller since day one. Made of black patent leather, they feature adjustable straps with gold buckles that enhance the shiny finish, while the low heels make them comfortable to walk in. Heel height: 1.5 cm. Material: 100% leather. Outsole: 100% Cuerolite.