Lilliputiens Jef Building Pyramid - Sturdy Cardboard Nesting & Stacking Blocks with Numbers 1 to 10 The top of each block counts from 1 to 10 to help teach numbers. Stack them up and knock them over.....little ones will do this over and over! Stack up these nesting blocks to build Jef the dog. LOOK at the characters through the fire ladder - peek-a-boo! Made of sturdy cardboard and stacks within each other for easy storage. A lightweight building solution! Created in 1995 by two mothers in Belgium, the lilliputiens family continues to astonish with its color pallets, range of materials and its universally endearing characters Lilliputiens toys are both durable and safe. Each toy is tested by independent external labs and granted a certificate to prove it has satisfied all European and international quality standards.