Practical, simple, pin style couplers.
36 pairs of couplers, laser-cut from 3mm ply with 0.6mm piano wire for links.
Thats only 20p per pair :)
These are designed to be used in place of Kadees to achieve a closer looking coupling in rakes of short cars.
The link can be lifted with thin pliers or tweezers but I wouldn't recommend them for use with a lot of shunting - not unless you have excellent dexterity!