Retail giant Amazon continues to improve its efficiency to offer faster services with the holiday shopping season upon us… including these new shipping robots.

TIME recently highlighted the company’s new robots made by Kiva Systems — a company Amazon purchased for $775 million in 2012 — as they help employees at an Amazon Fulfillment Center process orders.

They were reportedly first deplored this summer, and Amazon now uses more than 15,000 robots in 10 of the their shipping warehouses.

According to TIME, the days between Thanksgiving and Christmas are Amazon’s busiest of the year. Last year, customers ordered 426 items per second on the Monday following Thanksgiving, which is known as “Cyber Monday.”