i could not get this to produce the rainbows with office lighting,led-type flashlights. i am going to try regular lilghtbulbs. it works with sunlight. i am not a science teacher so i do not know if a glass (breakable) prism would give me more light sources for the rainbow effects or if it has to have sunlight. They were still fun to watch the refracting angles it would send the light to, but i was trying to produce rainbows at a nighttime class. It es extremely tough and durable and cheap compared to the allglass ones though.

Justo lo que esperaba; un prisma que funciona, ligero, muy divertido y perfecto para la escuela. Lo uso en mis fotografías también

This prism was significantly more expensive that the least expensive but is listed as having a book that goes with it. The book is actually about 2 inches wide and 4 inches long and contains so little that its hard to believe anyone could list it as a "fun and informative guide book".Pass on this one.

While the description clearly states this product is made out of "high quality optical glass" it is in fact made out of plastic. I paid twice as much for this prism specifically because it was advertised as glass. Bad seller

materiel is soft.....why?????b ware it scratched immediately sooo soft why even bother if n0ot to get the easy dollar b ware