Occasionally the clappers have leather pads (called "muffles") strapped around them to quieten the bells when practice ringing to avoid annoying the neighbourhood. Also at funerals, "half-muffles" are often used to give a full open sound on one round, and a muffled sound on the alternate round – a distinctive, mournful effect. This was done at the Funeral of Diana, Princess of Wales in 1997.