This plastic insert changes the Mini Advance or the new Mini II Advance incubator capacity from its standard 7 chicken eggs to 12 smaller eggs (pheasant or quail eggs or smaller). Now protected by Biomaster antimicrobial additive: proven to reduce bacterial growth by 99.99% and 100% safe for eggs, chicks and humans. Protects hatches from microbial transfer by cross contamination helping to reduce unexplained hatching failures.