These are large spools of assorted colors heavy duty hand sewing thread
Gutermann 50 WT Natural All-Purpose 100% Cotton Thread - Tex 20 - 876 yds. - WAWAK Sewing Supplies
Industrial Sewing Thread
3 DIFFERENT TYPES OF THREADS-BASIC GUIDE
is a heavy-duty thread put up on small 2 oz spools used for small hand sewing jobs. 251 yard spools. Monitor colors are good representations but
Nylon Hand Sewing Thread
How To Get Started in Sewing
FEPITO 21pcs Leather Waxed Thread 8 Color 264 Yards 150D Leather Sewing Waxed
THE 7 BEST HEAVY DUTY SEWING MACHINES
Sewing tips for beginners: Important info about needle and thread
Industrial Sewing Thread
21 Types of Sewing Thread & When to Use Them (+ PDF Chart)
Essential Tools for Heavy-Duty Sewing - Klum House
Types of Sewing Threads - Makyla Creates