This set of Hand Massage Eggs come in three different resistance strengths; perfect for training or strengthening hands forearms and fingers.Each colour provides a different level of resistance:Soft (Red)Medium (Green)Firm (Blue)Hand Massage Egg Dimensions: 5.6cm x 4cm.Age Recommendation: 4+Warning: Not suitable for children under 36 months due to small parts. Choking hazard. Adult supervision is required at all the times whilst is use.