1) Compatiabled for Oral-B toothbrush heads and apply on Braun eletric toothbrush 2) US Dupont Tynex #612bristle, soft and massages the gum 3) We have the patent for this toothbrush head 4) Replacement brush head fits famous brand of Braun eletric toothbrushes 5) Rounded bristles in center protect teeth from too-firm brushing 6) Dentists recommend that you replace the head every three months Packing: 4pcs/pack with blister packing Outer box size: 52 x 41 x 32.5 cm ( 250 sets /outer box) Inner box: 39.5x9.8x15 cm (25 sets/ inner box) G.W. / Outer box: 12.25kgs Delivery day: 10~15day after receive your payment.