Snap Strips for Duvet Covers Included in Snap Strip Set: 4 Double Corner Snaps 8 Double Side Snaps Made hold you duvet insert in place, no sliding to the bottom Strips are made of white 100% cotton sateen fabric with white snaps already attached Ready for sewing into Duvet Inserts and Covers. No special setting tools are needed 8 Side Snap Strips are 2 1/4'' with snap at one end for duvet sides, 4 Corner Snap Strips are 6'' long with snap in middle for duvet corners.