The issa hybrid replacement brush head from foreo has been developed for powerful and effective cleaning whilst remaining gentle to teeth and gums durable and flexible the unique brush head features premium grade silicone outer bristles to reach the gums and inner pbt polymer inner bristles that vigorously remove plaque build up soft and non abrasive for the ultimate brushing experience en size h80 x w15mm weight 98g user time up to 6 months please note this replacement head is