Replacement brush heads for electric toothbrushes, 4 pieces per pack. These are new, unused, and compatible products. 【Compatible Models】 EasyClean / DiamondClean / FlexCare / HealthyWhite / HydroClean / Essence+ / ProtectiveClean, etc. We use these with HX6521/01 and HX3651/32 without any problems. If the shape of the attachment part on your main unit is the same as the image, it should be usable. ※ We do not know about the compatibility of each model number. ※ Please determine compatibility based on the description and images. 【Product Details】 ・Product: Replacement brush heads ・Quantity: 4 pieces per set ・Bristle Hardness: Medium to slightly hard (personal assessment) ・Length of brush head: Approximately 2cm (measured with a ruler) 【Discount for Single Purchase】 Not applicable 【Discount for Multiple Purchases】 If you want multiple sets, we will discount 80 yen for each additional set. Example: 2 sets purchased → Product price × 2 sets - 80 yen 3 sets purchased → Product price × 3 sets - 160 yen ※ If you want multiple sets, please contact us before purchasing. 【Regarding Shipping】 ・Shipping Method: Yu-Packet Post mini ※ The shipping method may change if you purchase multiple sets. 【Regarding Packaging】 Due to being imported goods, there may be minor scratches or dents on the outer packaging. This does not affect the brush heads themselves. ■ Regarding Price and Shipping Method Due to circumstances, we cannot verify our identity. (If identity verification is not completed, only anonymous shipping can be set) Therefore, the price of this product takes anonymous shipping into consideration. ※ Other sites may offer cheaper shipping methods (e.g., regular mail), so they may sell at a lower price. Thank you.