Size: 15.25 Color: Brown The regular cat tree has evolved! This Go Pet Club cat tree has everything a regular cat tree has, PLUS a new exciting feature: an IQ busy box for your cat! This IQ busy box keeps your cats mind sharp and well-exercised and is perfect to keep your cats active, mentally and physically throughout the day. On top of the cat tree providing other features such as sisal wrapped posts for scratching and plenty of relaxing space, it also provides your cat with stimulation for their brains. Each IQ busy box contains two balls.