All models come in a Standard (default) and Tall version (which adds approximately 14" to the overall height of the tree). To order the 4-tier models, you will be asked to specify a primary colour for your tree. This will be the colour of the base and all levels of your tree except as allowed by the various options. In addition, all models allow you to specify a different colour or wood finish to the base and alternate top colours. The 4-tier models have optional ramps and ramps colours and also come with an inline base option for places with somewhat limited space.