Crimping is used in splice connectors, crimped multipin plugs and sockets, and crimped coaxial connectors. Crimped connectors are less expensive but require a specialised crimping tool. Crimped connections are common alternatives to soldered connections. The leaves have smooth edges, which can be wavy or crimped. It is joined using a solder/sweat, roll grooved, compression or crimped/pressed connection. The collagen fibers are comparatively inextensible and are usually loose (wavy, crimped). Staple fibers range from 1.5 to 15 denier and are mechanically or chemically crimped. Metal aglets may be crimped onto ropes or cables. When a shoelace is secured with a knot, the lace is crimped, or squashed. AstroTurf also introduced a product called "RootZone" consisting of crimped fibers designed to encapsulate infill. A larger tube was slid over that and the beads crimped off. Wool has several qualities that distinguish it from hair/fur&colon; it is crimped and elastic. It consisted of a pint-sized clear glass bottle with a crimped metal cap. Used in semi-automatic pistols, wadcutters must be taper crimped. It is joined using a sweat, compression or crimped/pressed connection.