1) Attached to a fishing line 2) Bobfloat 3) Cork 4) Float 5) Tackle box item 1) Bobfloat 2) Cork 
[motorcycle] A bobber is a custom motorcycle that usually has had the front fender removed, the rear fender `bobbed` (made smaller), and all superfluous parts removed to reduce weight. == History == The bobber was the earliest simple and stripped down variety of custom motorcycle. They are hand-built by individuals with mechanical skills, a...
• (n.) One who, or that which, bobs.
A float attached to the line under which a hook and sometimes a sinker hang. The bobber holds the bait or lure at a predetermined depth and also signals the strike of a fish (strike indicator). A variation is called a slip-bobber or slip-float, where the line runs freely through the bobber and there is a stop on the line for the predetermined depth...
Bob'ber noun One who, or that which, bobs. 
a float fixed to the line that holds the bait or lure at a set depth
(archaic, US)
a person or thing that bobs. · a fishing bob.