Used iMac 21.5-inch Retina 4K 3.0GHz 6-core Core i5 16GB RAM/1TB SSD (2019) AppleCare+ to June 22 2022

Powerful graphics, fast processor, Thunderbolt 3, fast SSD storage and the stunning  Retina 4K display

21.5-inch (diagonal) Retina 4K display
4096-by-2304 resolution with support for one billion colours
3.0GHz 6-core Intel Core i5 (Turbo Boost up to 4.1GHz)
16GB of 2666MHz DDR4 memory
1TB Crucial Technology SSD Drive
Radeon Pro 560X with 4GB of GDDR5 memory

Full Specifications