This 24 pcs. Jumbo Blocks Beginner Set is ideal for young kids who are just starting to play by putting things together and explore their creativity. Proudly made is the USA with durable plastic, these oversized and interlocking blocks have soft rounded corners and give a worry-free environment. Parents and children can have endless play possibilities and at the same time ensure the development of gross motor skills. Jumbo Blocks comes in 4 bright primary colors (Red, Green, Yellow and Blue) and 2 sizes (8 in. x 4 in. and 4 in. x 4 in.) Ages 6 months. Heart Rate: EKG Grip Pulse Heart Rate Sensor