his set includes 8 semi-translucent, bamboo-themed water channels. The individual pieces come in 2 different sizes. This set ideal for open-ended, sensory play. Nest them together to create longer tunnels and ramps for water or other rolling objects. They're made with durable plastic to last for years of home or classroom use. They can be used indoors or outdoors! Clean them with warm water and soap when playtime is over. For ages 2+. Sizes: 39.25"L x 4.25"W x 2.25"H - 19.5"L x 4.25"W x 2.25"H.