Bowling ball to skid longer before reacting (hooking). Reactive cover stocks finishes include "matte" (aggressive reaction), "shiny" (longer skid distance than matte finish), "pearl" (greatest skid distance among reactive cover stocks), and "hybrid" (combination of skid distance and back end reaction). Duckpin balls weigh each, with up to three balls delivered per round (or "frame") of bowling for one bowler. The duckpin ball has a maximum diameter of , slightly larger than a candlepin ball but, like a candlepin ball, contains no finger holes. Duckpins are correspondingly shorter and lighter than their ten-pin equivalents and it is more difficult to knock them
Ten-pin bowling between members. In addition, affiliated to the BTBA is the Young Adults Club (YAC). University & College tenpin bowling is administered jointly by the British Universities Tenpin Bowling Association and the Tenpin Bowling Sports Advisory Group of BUCS (British Universities & Colleges Sport). Wales, Scotland and Northern Ireland all have their own governing bodies, with similar responsibilities to the BTBA for their respective regions of the UK. In the United States, the governing body of ten-pin bowling is the USBC (United States Bowling Congress). The USBC became the "administering organization" on January 1, 2005, after following separate groups merged: the