the HengLiSam Stacking Rocks, is a delightful Montessori-inspired toy crafted from silicone. This set of 24 colorful stones is designed to engage kids minds in sorting, stacking, and building activities. Perfect for developing fine motor skills, problem-solving abilities, and hand-eye coordination. Encourage creativity and imaginative play with this versatile Stacking Rocks sensory toy that combines education and fun. Making them an ideal gift for boys and girls. Lightweight and portable, it’s a great companion for travel or playdates. Discover the joy of open-ended learning with the HengLiSam Sorting Stacking Rocks Stones. Product Name: HengLiSam Sorting Stacking Rocks (Sensory Stone) Product Material: Grade A Silicone Raw Materials. Safe, Odorless, BPA FREE, Skin-Friendly! Sturdy, Waterproof, Easy to clean! 6 Colors 6 Sizes 6 Shapes 6+ Ways to Play and Exercise 24 pcs Set, Weight about 320g. Age: 3 years+ Certificate: US CPC Certified: 16 CFR PART 1303 ASTM F963-23 Standard EU EN71 Certified: EN 71-1: 2014+A1:2018 EN 71-3: 2019+A1:2021 EN 71-2: 2020 Standard This sensory stone toy has multiple play features: Puzzles to exercise the imagination Spell letters and numbers As arithmetic sticks for math addition and subtraction exercises Color sorting and sequencing: Sorting and sequencing shapes: Stacking 3D objects to work on kids’ spatial perception. How to Choose? Entry level recommend: buying 1 set of Stacking Rocks for 3 year olds, which will stimulate your child’s imagination, hand and eye coordination while guiding your child in the shaping of the stacking rocks. Advanced level recommend: buying 3 sets of Stacking Rocks for a 6 year old, or more. Children can build as many magnificent 3D buildings, 3D blocks, 3D animals, whatever they want. How to Choose? Entry level recommend: buying 1 set of Stacking Rocks for 3 year olds, which will stimulate your child’s imagination, hand and eye coordination while guiding your child in the shaping of the stacking rocks. Advanced level recommend: buying 3 sets of Stacking Rocks for a 6 year old, or more. Children can build as many magnificent 3D buildings, 3D blocks, 3D animals, whatever they want.