It’s Time for Competence Enhancement! Concentrate on stringing the blocks one by one. Exercise your kids’ finger dexterity and concentration. Each comes with 3 different sizes of holes and cards at 5 levels of difficulty. Guide kids from simple to difficult. Stringing and stacking, unlock more ways to play. The blocks are polished to a high standard. Care for your kids’ tender hands. Eco-friendly water-based painted, pass international tests. No harmful substances are included. This number themed one helps kids get to know numbers, learn plus and minus. Age: 3+ Box Measures: 3.66″ x 0.83″ x 1.85″ Including: 12 beads, 1 string Piece Count: 12 pieces Material: Lotus wood