Create your own unique storage combination with this Den Cave Roof Add-on. Simply select a compatible base unit and attach using the Allen key/bolts supplied. Designed to ensure a secure fit.n• Requires two same height unitsn• Removable washable fabric covern• Self-assemblyn• Compatible with 900mm wide unitn• Manufactured in the UKn• 10 year guaranteenW1640 x D900 x H840mm