Reddit reviews Kokuyo Harinacs Press Staple-free Stapler; With this Item, You Can Staple Pieces of Paper Without Making Any Holes on Paper(White)

https://www.amazon.com/Kokuyo-Harinacs-Staple-free-Stapler-Without/dp/B00O9N1BHA

https://www.amazon.com/Kokuyo-Harinacs-Staple-free-Stapler-Without/dp/B00O9N1BHA/ref=sr_1_2?ie=UTF8&qid=1521689358&sr=8-2&keywords=kokuyo+stapleless+stapler

Not in the class so I’m not entirely sure if this is exactly what you’re talking about, but here’s a staple-free stapler . Other staple-free staplers are available.

This is the older version: (I have one, it's cool, it works)

Kokuyo Harinacs Japanese Stapleless Stapler Ten-sheet binding White SLN-MSH110W 

https://www.amazon.com/dp/B00F2YSL7S/ref=cm_sw_r_em_apa_gNlMAbQM22PBE


This is the newer version:

Kokuyo Harinacs Press Staple-free Stapler; With this Item, You Can Staple Pieces of Paper Without Making Any Holes on Paper(White) 

https://www.amazon.com/dp/B00O9N1BHA/ref=cm_sw_r_em_apa_HKlMAbDXXKWVA

https://www.amazon.com/Kokuyo-Harinacs-Staple-free-Stapler-Without/dp/B00O9N1BHA
(Not one here but similar)
It's more or less a crimper as staplers technically make holes.

They are neat