21 Rubber Eggs
Can be used as a practical joke, in an egg and spoon race or to simply bounce on your kitchen.
- 15 women aged between 20 to 30 years old, living in Leeds or in the vicinity of Leeds,
- 30 men and women aged between 18 and 35 years old, living in Leeds or Sheffield,
- 10 men aged between 25 and 45 years old living in Greater London,