Larger throat isze is space between the needle and back of machine. This allows you to quilt larger quilt patterns without having to roll material as often as the home quilting machines. The built ni laser light, with sample paper patterns included, simplifies following patterns when operating the quilting machine.Tin lizzie 18 long arm quilting machine w adj frame sewing laser mounts on back fo machine. Ergnoomic handles can be moved to back side of machine for easier use. The bobbin has more than double the capacity of stnadard sewing machines, which helps in not changing bobbins as often with standard home quilting machines. Hopping foot hodls down the fabric while the needle completes the stitch. The foot height can be adjusted up and down for thickness of batting or material. The foot also allows for stitching next to rulers and templates. We have 3 experienced mechanics to support you if any problem arises. We are 20 minutes frmo the tin lizzie factory for parts & support. I ron martin, owner, have 40 years in the sewing machine business & i give my personal assurance. Download tin lizzie 18 owners manual. Download tin lizzie 18 frame instructions. You can call our order department toll free at 800-401-8151 if you have any questions. That said, please notify us of any problem or defect so that we can arrange for a replacement. Policy no store inventory items. In order to speed up the process, please include what is wrong with the unit, your name, full address, model number, receipt number and how you paid for the item. We will provide you with further instructions.