A set of golf clubs in accordance with at least some examples of this disclosure may include one or more iron-type golf club heads with a slot, or pocket cavity, behind the ball striking face of the golf club head. Further, one or more of the golf clubs in the set may include iron-type golf club heads with a split cavity or half cavity configuration. Additionally, one or more of the golf clubs in the set may include iron-type golf club heads of the blade-type. Also, one or more of the golf clubs in the set may include a hybrid-type golf club head with a cavity, or compression channel, extending through the bottom surface of the club head behind the ball striking face of the golf club head and one or more additional cavities extending through a bottom surface of the club head.