Open toys, such as our silicone stacking toys, make learning interactive and interesting. Ideal for sensory play, motor skill development, hand-eye coordination and color recognition. Silicone rainbow toys: modern plastic-free alternative to classic wooden rainbow stacking toys. Our silicone rainbow stacker is made of edible Silicon, which is durable, soft and flexible without cracking or chipping. Simple cleaning: both parents and teachers are very convenient. Our silicone stacking and nesting toys are simple to maintain and easy to clean. Just wash with warm water and soap or wash with dishwasher. You can also use boiling water *. Durable, soft and flexible: our stacking rainbow toy is made of edible Silicon, durable, soft and flexible, perfect for kids who like to chew and tap everything.