For this question I would suggest going to a friend or music store and asking the repairman or salesman to look at different pickup models. Look closely at the construction and all the components that make up a pickup. Make notes and find broken ones to pull apart. You’ll learn that a Stratocaster pickup has a cover but a Telecaster has an exposed bobbin in the bridge position and a chrome plated cover used for the neck position. Fender pickups look pretty basic but many great sounds have come out of them.