Sterling Silver Earrings with Zoo biscuit PLA pendant. Our ZOO BISCUIT fridge earrings are too cute for words . This is a great gift for any South African. We love ZOO BISCUITS & this will definitely bring a smile to many faces.Dimensions (20mm x 16mm x 5mm). They are 3D printed using Polylactic acid, also known as PLA. This is a thermoplastic monomer derived from renewable, organic sources such as corn starch or sugar cane.