4x4 vinyl stickers w/QR code

I ordered the sample packet of 4x4 inch vinyl stickers using our design (which included a QR code). There was concern from Sticker Mule that the QR code was not readable. The stickers arrived and the QR code is scannable! The only challenge with the stickers is that it is hard to peel the paper backing from the vinyl. I will be submitting the full order today in preparation for our early Fall event. Thanks