It's the WAVE IT® ONE Machine Quilting Ruler/Template by Michael Davison for Quarter Squared Quilt Co.
This versatile template has a large wave on top side and smaller waves on bottom. Both sides include needle-stop which allows you to stitch out a seamless continuous wavy line across the width of your quilt or design.
I walk you through stitching out several sample designs in the video.
I am using Glide40 for top thread and Glide60 for bobbin thread.
WAVE IT® ONE template
https://michaelquilts.com/product/wave-it-one-wavy-lines-and-curves-template/
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www.michaelquilts.com
Ending Titles Music by LegatoProMusic has been licensed through Audio Jungle/Envato.