Size 4.0/100 Schmetz Jeans Twin needles

Standard flat sided needle.

Feature: Modified medium ball point and reinforced blade.
Fabric Use: Denim and similar fabrics. Advanced point design is a SCHMETZ exclusive. For penetrating extra thick woven fabrics, denims, or quilts with minimum needle deflection, reduced risk of needle breakage and skipped stitches.

Twin
Double needles are actually two needles mounted on one shaft used to create two rows of stitches simultaneously. Use two spools of thread and one bobbin thread.