Why would I buy it?
1. Even though you would pay less for Dritz tailor's ham and seam roll, her sets look adorable and are available in different designs. I noticed in her Etsy shop that she even makes custom sets.
Here are few examples:
2. They are made really well: quality materials, wool and cotton side, extra firm, filled with sawdust, and additional sawdust included (!). Here is the description of her set:
A colorful and whimsy twist on these classic pressing essentials. Handmade Tailor's Ham and Seam Roll set; pressing aids for the "hard-pressed" stitcher.
These essential dressmaking aids are made from all natural materials. Each have a 100% cotton side, a 100% wool side and are lined inside in 100% cotton muslin. The cotton side is for pressing with high heat and the wool side is for pressing with low heat.
This Tailor's Ham and Seam Roll set are hand stuffed, extra firm, with recycled white pine sawdust flour. Additional sawdust and a strand of embroidery floss is included with your purchase should you need to refill your Tailor's Ham or Seam Roll. Please note that depending on wear and tear and climate conditions, sawdust compacts naturally and refilling your pressing aids might be necessary. All fabrics have been pre-laundered and will not shrink or bleed. The Tailor's Ham measures approximately 6 x 9 inches wide and Seam Roll measures approximately 11 x 4 inches wide. A ric-rac hanging tag completes each ham and roll and is perfect for hanging when not in use.
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| additional sawdust is included in the set by The Cupcake Goddess |
3. And, finally, I would rather buy handmade products by local and independent designers, artists and artisans rather than mass produced tools.
For more sewing tips and fun visit her blog: The Cupcake Goddess
P.S. I just want to add that I am not getting any fee or commission for this post, it's my personal point of view and I would love to hear your feedback on the topic of local artisanship vs mass production.
(as the one on the image) because, with careful shifting, it can draw all the mentioned shapes and more. 
. “It combines the functions of a hip curve, ruler and French curve”, claims the description for one available on Amazon. I, personally, find the French curve to be more versatile, and also own a 
. 
. However, if you want to make it yourself, there is 
for both pieces available again on Amazon. Finally, there are 
. New York: Exeter, 1984. Print
(a little bit pricey but totally worth it!) explains in detail how to use grainline to evaluate fit. The authors caution that the grainline can be difficult to recognize, especially for less experienced dressmakers. “To simplify recognizing grainline during the fitting process and in the completed garment, it is advisable to transfer pattern grainlines onto fabric pieces with a marking tool such as pencil, transfer paper, or thread, depending on the type of fabric and the use of the garment… with practice, your eye will quickly identify grain position on the body and recognize even subtle needs for adjustments.”
: “The cross-chest and cross-back lines fall at the narrowest part of the chest and at the midpoint of the armscye. The bustline falls at the base of the underarm and may not actually be at the bust point.”
