I found this handwriting tape set several years ago. I love it.
It fits the bill for our required scientific based program.
It comes with letter trace cards. They are laminated and meant
to be used with a dry erase marker. I run them off on copy paper-
my kids use their crayons instead of dry erase markers. We use
the same page all week - on Friday they take it home.
After we have listened and followed the directions on the tape,
we follow up with handwriting practice sheet.
Here is the link to the handwriting pages I use: