Tie even yarn tassels
A tassel looks more even when its strands lie orderly during winding and are trimmed only at the end.

Use a card to establish the length
Cut firm card slightly longer than the intended tassel. For a finished length around 7 cm, approximately 2¾ inches, an 8 cm winding height is a starting point. The head and final trimming use some length. A bending card produces unequal strands, so choose one that withstands gentle tension.
Use yarn that can be cut and tied without immediately separating into loose fibers. Smooth cotton shows individual strands, while soft wool gives a fuller appearance. Avoid combining many very different yarns in the first sample, since that makes it harder to understand what controls the shape.
Match the tassel care to anything it will be attached to. A washable cushion cover fitted with delicate wool tassels is no longer as straightforward to clean. A removable attachment may be more useful. On a purely decorative tassel, the binding thread can remain visible as part of the head color.
Wind without bending the support
Wrap the yarn repeatedly around the card with moderate tension. Arrange the turns beside one another in thin layers. A fixed wrap count applies only to that particular yarn. If making a matched set, record the count after a successful first sample.
Pass a separate strong thread under the upper turns and tie them together. It can become the hanging tie. Cut the loops at the opposite lower edge while holding the top securely. Let the strands hang and arrange them gently with your fingers rather than combing aggressively.
Tie the head and trim the skirt
Wind another thread around the bundle a little below its top. Secure it and hide the ends among the strands. The head should be distinct without squeezing so tightly that individual yarns pull out. Check the hanging tie with a gentle pull before trimming.
Wrap a paper cuff around the lower portion and cut projecting strands along its edge. Rotate the tassel and inspect several sides. One large cut through a compressed bundle often leaves an uneven line after release. Use the first finished tassel as a length reference for the rest. Store them hanging or lying loosely; a tightly packed bag can bend the newly arranged strands.