These 4x4 building blocks make an ideal stacking set and invite everyone to play. Unvarnished lime wood blocks, non-toxic water-based stain with a non-toxic plant-based finish. Single blocks: 4 cm thick x 2-16 cm long. Wooden storage frame: 44.5cm long. Ages 3+. Note: Use soapy water with a damp cloth for cleaning. Dry immediately. Please do not submerge in water and do NOT use disinfectant or hot water.