My Mute, at 260 grams, with an adjustable arm that reaches down onto the bridge and securely clamps, is the most effective practice mute we have found. It is the combination of the mass and ability to suppress more vibration in the wood that makes this superior for cellists in apartments, hotel rooms, with sleeping family…anyone who needs major sound reduction while needing to still practice productively. Due to variations in bridge cut, low or high heart, the results may differ slightly. But you can see why it is a good/safe fit regardless of the bridge’s curvature. This item will be back in stock before the end of April – price subject to change.