We are Flyko, we have marketing our own product for 8 yrars.our main priduct are led video curtain and led star curtain.We have 4 certificates to guarantee product quality: CE, RoHS, Fire-proof, and Patent.Effect pitch 3.5 is the newest product size and only we can provide this. It presents higher definition and more delicate graphic. Below is the comparison between 18cm and 3.5cmCurtains in different pixels present different effects. You can choose according to actual need