Description: Kids stepping toy training tool for children & physical balancing, jump from one to another without touching the ground or floor; vary the positions to create more challenging paths or even obstacle courses for advanced children; Textured top surface and rubber the base to prevent slippage; Safe on hardwood, carpet, playground rubber mulch, concrete, grass; Will not scratch wood floors or slip on carpet. Nest inside each other for easy storage; Stack the large and the small can neatly or be placed under the large ones as a shell. River rocks encourage imagination & creativity while improving gross motor skills, Made of durable plastic for simple cleaning & many years of reliable entertainment;recommended for Ages 3+ Specification: Material: PP Color: Red, Blue, Green, Yellow, Orange Size Chart: Blue: 8x30.5cm/3.15x12.01inch. Orange: 8x31.5cm/3.15x12.40inch. Green: 27.5x8cm/10.83x3.15inch. Yellow: 8x23.5cm/3.15x9.25inch. Red: 6x17cm/2.36x6.69inch. Package Includes: 5 Piece River Stone Toys Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement. Thank you for your understanding.