These are NEW High Power Rare Earth Cadence and High Power Spoke Magnets. They will g ive you more reliable readings at a greater working distance than the stock magnets. These magnets is much more powerful than your stock magnets. The Cadence magnet is held to the pedal arbor by strong magnetic attraction and the spoke magnet will need to be epoxied to the spoke. These will be shipped in a First Class mail envelope. If you haven't received it in 7-14 days email me. The Post Office has been getting slower so please be patient. I WILL NOT SEND TO MAIL FORWARDING ADDRESSES. I have had problems with them losing magnets. If You do not live in the US and are using a mail forwarding service there may be problems.