I took a photo here for you I have just put one on my arm They come two in a packet each patch is 5cm by 5cm
They are opaque
They go on your arm, buttocks anywhere where there is no hair and stick to your skin (not clothes) Your body absorbs the Vitamin B1 and is effective within minutes -and your whole body is covered You can bath and swim with it but if your scrub it it will come off.
It remains effective for a minimum of 36 hours and even if you swim it is still effective So if you going to use it tonight you put it on in the late afternoon and it covers your for the night, next day and night. Then you replace.