Dollar Tree sells a pack of plastic palette knives.
![Plastic Palette Knives Plastic Palette Knives](workbench/pics/gen/2024/856243a.jpg)
I find palette knives useful when applying and contouring filler on bases.
![Plastic Palette Knives Plastic Palette Knives](workbench/pics/gen/2024/856243b.jpg)
I generally prefer metal palette knives, as I like the feel and they don't break.
![Plastic Palette Knives Plastic Palette Knives](workbench/pics/gen/2024/856243c.jpg)
However, the advantage of plastic is that you can file the width down to whatever you need. Above, you can see that I've made a custom palette knife for contouring filler between 15mm figures on a multi-figure base.
(You may say: but there is already a narrow-tip palette knife in the set! To which I reply, yes, but it's plastic, it easily breaks, and it is too pointed; the modified thicker knife is more durable.)