Tree Trunk Cat TowerThe Tree Trunk Cat Tower is probably the heaviest single post sturdy scratching post currently on the market. Weighing in over 12 kg in weight and 60 cm in height. Meets the needs of all cats & kittens 0. 6 m solid cat scratching post 30 cm square 19 mm Quartz Base ( posts up to 0,9 m) 30 40 cm square 30 mm Quartz Granite Base ( post heights over 1 m) Caramel Bamboo Disk(s) 2 year guarantee note this tower is not extendable on 19 mm quartz base option