They are a small spoon blade soldered to a hook then painted. They are known by many names but most common up north the are referred to as pin mins.
When I make my own I will use straight abeerdeen hooks and jig hooks. The jig hook gives the finished lure a horizontal presentation. The straight hook a vertical one.
The can be tiped with pieces of worm , wax warms , maggot or articial stuff like plastic tails , or crappie nibbles. They do produce year round not just thru ice.
Garminarmin gpsmap 1040 xs networked with Garmin gpsmap 1242 xsv , Panoptix PS 30 and PS 31. Livescope LVS 32
Ice rig Echomap Ultra 106SV with LVS 12 and GT10-IF