Suitable for 40B: CT2S, CT4S, CT2CC, CT4CC, CT5CC, CT6CC High-Quality Materials: Made of high-quality materials for continuous, efficient, and easy-to-use performance Optimal Shaving Performance: For best results, replace the shaving head every 18 months. After 18 months, the shaver may have trimmed over 6 million hairs, which can gradually reduce cutting efficiency Advanced Processing Technology: The replacement head features advanced processing technology to enhance the shaver's performance Restore Shaver Performance: Replacing the head helps restore your shaver’s performance and provides a better shaving experience. Regular replacement keeps the shaver in optimal condition for years Color as shown Material: Plastic + Metal Package Contents: 2 x Shaving Accessories Package includes only the items listed above; other products are not included Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3 cm