Comfort fit 4mm ring with a customised heartbeat. You can send us your own heartbeat for this ring. Please scan & email your ECG to us for engraving your own heartbeat. Please note, the black enamel is temporary & may come out over time. This is a custom made ring, made only on order. Custom made ring orders are not eligible for cancellation, exchange or refund. Advance received for custom made rings are non-refundable.