Common materials include polyester, cotton, foam and Lycra. A few listings also (unexpectedly) mention steel.
Sizes range from pre-cut sheets (for example 3" x 5") to narrow rolls (about 1" x 5 yards) and larger multi-yard rolls such as 21.4 yards with a width of roughly 2.75".
They reduce friction to help prevent blisters, providing lightweight, breathable protection that conforms to fingers and reduces irritation from repetitive grip pressure.
They either use an adhesive backing or are made from self-clinging/self-adhering materials so the tape stays secure through swings and activity.
Many tapes are designed to be cut-to-fit or are easy to tear so you can trim pieces quickly to match individual finger sizes and taping needs.
Available widths include narrow 1" tape, sheet-style 3" widths, and wider pre-wrap rolls around 2.75" wide.
Some products advertise flexible support for weak or injured areas and use for keeping pads, socks, other protective gear, or hair in place while playing.