This egg simply sit in place. For split coloured eggs, let me know the base and top colours after purchase, Extra colours available for split dragons: White, black, red, orange, blue, green, brown, gold, silver, grey, yellow, purple, pink. SIZING: Baby egg can fit keychains Small egg can fit baby and mini dragons (Baby rose dragon require Large egg-Baby crystal dragon and baby winged dragon requires medium egg) Medium egg can fit baby Winged dragon, Small dragons up to 38cm lenght Large egg can fit medium dragons up to 48cm and baby rose dragon XL egg can fit dragons in any medium size XXL egg can fit any and multiple dragons with the exeption of the XXL MEGA Articulated Dragon