Anykicks are extremely strong and exceptionally durable. Metal was used in the early prototypes, but proved to have many disadvantages that the plastic prototypes have overcome. In order to be made reliably, metal should be machined or extruded, these processes are costly. Metal platforms made engaging the pedals difficult in the event your cleat missed the pedal engagement point, causing your foot to slip off the pedal body. This type of slippage can damage crank arms, or more sensitive parts of your anatomy(ask me how I know). Plastic does not have this problem, as it tends to provide some grip in the event of a missed attempt, additionally it will not damage cranks, or other parts of the bike. Also the plastic platforms are considerably lighter, giving you a sensation that Anykicks are part of your shoe as opposed to a bulky attachment, this makes engaging the pedals more natural than the heavier metal platforms allowed. Plastic also has the advantage of being extremely easy to make complex designs out of, and I was therefore able to reduce the unit cost and mold cost by getting rid of the threaded cleat attachment holes, and instead utilizing a system of molded hexnut holders and separate metric jam nuts.