This Plus-Plus Tube contains 100 interlocking pieces in a reusable, travel-friendly container ideal for creative building anywhere. This Tube includes step-by-step instructions and all pieces needed to build a robot, or use imagination to create custom models and unique designs. This building toy supports fine motor development and spatial reasoning while encouraging open-ended STEM play. This set is free from endocrine-disrupting substances, offering a safer choice for everyday play. Plus-Plus delivers durable, precision-fit pieces and compact packaging that make this kit a great travel activity, classroom resource, or gift.