Jim, The one that i bought and use are the Mcnett ankle weights, Brad's reply #8 put a link to a site that sells them. The other Gentlemen also offer you great suggestions at a cheaper price. I do cut off the attachments, and use a Zip Tie to keep it together. There is a draw back depending on your stock length and rest system you use, ( not having enough room for the weight attachment). If you decide to give it a try, buy the regular one the large will be to big, and they do stretch.
Jim, it was a quick fix to help balance out the rifle. I still use it on my rifle, but will be re-placing it with a weighted butt plate in Brass.
I hope this helps and Thank You Gentlemen.
Take Care.....Joe