Mechanical brakes in most cheap baitcasting reels rely on a pin system which creates friction during the cast to slow down the spool. Magnetic brakes are usually more expensive but can be adjusted just like mechanical brakes.

2019 Yumoshi Right Or Left Hand Baitcasting Reel 12 1bb 6 3 1 Bait

Carbon Baitcasting Reel 13 1 Bb Super Light Casting Reel

Shop Generic 18 1 Ball Bearings Baitcasting Fishing Reel With

Bait Casting Fishing Reel Nmb Bearing 180g Solid Main Body

Kastking Right Left Royale Legend Baitcasting Reel 12bbs 7 0 1