All models come in a Standard (5 feet tall) and Tall version (6 feet tall). 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.