I thought they were at first as well. Then it was explained to me at another group that there are Beaded (fit into a bead receiver) Overlap (hang over wall and is adjusted to fit the inside) then J-Hook (sometimes called J-Bead, Universal Beaded - they are fitted to the size of the pool and hook over/onto the top edge - reported to be easiest to replace when needed, not prone to ripping or separating like the beaded) So, will see how it works out.