Here is a 3 INCH WAVY LINE OP ART CASSETTE effect for OPTIKINETICS PROJECTORS SOLAR 250 , GOBOSHOW , GOBOPRO,  K1 , K2 , K2 +,K4  designed by light designer LIGHTNING ROD from BUBBLE VISION .

He has been making these wheels for over 10 years 

Opti has now stopped manufacturing the 3 inch cassette so effects like this are becoming rarer and rarer.

PLEASE BE AWARE THAT YOU WILL NEED A 3 INCH CASSETTE ROTATOR TO RUN THIS  .

Please take the trouble to view a video clip of this cassette by going to

 https://www.youtube.com/watch?v=Dqes3ACUCn8

or copy paste this link( phones and tablets)

https://bubblevision.uk/Oil-Wheels-Cassettes/buy-3-inch-cassettes/metal-and-etched-designs/wavy-line-cassette/