Each one has it's own sound, that what the customer asked for. 4 calls made of the same woods, but each having a different sound to them, without changing any woods or strikers. 1. has a high pitched start with a soft rollover and light rasp. 2. has a high pitched start with a big break rollover and a chattery rasp. 3. has a mid tone start with a big rollover and deep chattery rasp. 4. has a young hen high pitch start with a med rollover and a high chattery rasp for a young bird call.