Ideal for light box exploration and colour patterning, sand and water trays, messy play, clear mud and other ideas - have fun! Each 10g pack will make approx 1.5 litres. Approx 400 balls. Rec 3+ Yrs. Supervision advised. Leave for 6-8 hours in water for the beads to fully grow and then drain off excess water. Size will be around 10-15mm when grown.