Apple's Mac-series product shipments are expected to remain at a level similar to that of 2015 at around 20 million units in 2016, but despite flat shipment performance, new MacBook and iMac products for 2016 are expected to boost the company's overall product ASPs, according to sources from the supply chain.

Makers in the supply chain are expected to start producing new 12- and 13.3-inch MacBooks at the end of the first quarter or in early second quarter, and 15-inch models in the third quarter, said the sources.

Apple shipped 5.312 million MacBook products in the fourth quarter of 2015, sliding 7% from the previous quarter and 4% from a year earlier.

For all of 2015, shipments of Mac-series products were up 4.03% to 20.38 million units, while Mac revenues increased 2.61% to US$25.273 billion, according to the company.

Shipments of iMac products totaled about five million units in 2015, indicated the sources.