[User Age] The /kids electric toothbrush replacement head is suitable for 4-8 years old / under 4 years old. Children should use this product under parental supervision. [High-quality material] The toothbrush is made of soft and high-quality material to protect children's gums [BPA Free] No BPA is used in the production process. Xige cares for your child's growth. [Pack of 6] Each pack of 6 replacement brush heads lasts for a year and a half. For best results, replace brush heads every 3 months. Type:SG-831 for 4-8 years old/SG-025 for under 4 years old Colour:As Shown Material:Plastic Package Contents: 6 * toothbrush replacement head Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.