This Listing is for Brand New Set of 10 High Quality Large Capacity Aluminum Bobbins for Tin Lizzie 18 Long Arm regular and Tin Lizzie 18 LS Models.
Aluminum bobbins are considered the Top-End "Luxury Bobbins". They offer less resistance which translates to less drag to the bobbin thread tension.
Also fit HQ16 by Handi Quilter, HQ18 Avante, A-1 LongArm Quilter