48 Spools Threads:
20 Cotona
20 Decora
8 Glamor

The Deco / Overlock Inspirations Incredible features: 20 X 100M COTONA #4 spools, 20 X 100M DECORA # 6spools and 8 X 100M GLAMOUR # 8 spools. The remarkable thread box holds colors separately and allows the spools to be easily removed and replaced.
How the Incredible Threadable Box Works Video is on Rayon, not Serger Thread.