Material: Made of high quality poplar plywood material,natural,lightweight,durable and sturdy, Suitable for children over 3 years old and adults Size: Approx. 12" x 12" x 12"/30cm x 30cm x 30cm, 2.5mm in thickness Balloon sizer cube: 9 different holes with marked,including 10"/25.4cm,9"/22.8cm,8"/20.3cm,7"/17.8cm,6"/15.2cm,5"/12.7cm,4"/10.2cm,3"/7.6cm,2"/5cm