Shingles On The Hands Why Does My Hands Feel Like There Are Little Slivers Of Glass In Them After I Took Shingles Off A Roof?

Why does my hands feel like there are little slivers of glass in them after I took shingles off a roof? - shingles on the hands

I removed the tiles on a roof today, and I know that is not glass on the floor, but after swimming my hands still feel that the glass in them. Does anyone know this?