Crystalware Plastic Sip Stirrers 7 1/2 Inch 1000/box, Red

Are these hollow? Also, I'm looking for narrow straws to use to build paper beads on. Does anyone know how big the hole is? Thanks!

can i use it for hot drinks ??

what is the diameter of the straw? is it 4mm outer edge to outer edge?

What are these made from? are they bpa free?