This Bobbin offers you adjustable thread tension. The Standard bobbin is probably the most popular of all the Rite-Bobbins. It's the model that works for just about any fly pattern you may want to tie. Features of the 4 models we carry are below: Standard model FEATURES: Our ultra-versatile and most popular fly tying bobbin Ceramic Thread Tube Small Diameter Barrel Removable Vinyl Grip Solid Brass Arm "Click" Drag Adjustment 1-9 ounces of thread tension Half Hitch model FEATURES: Unique tapered barrel and O-ring grip (colors vary) Revolutionary bobbin design allows you to half hitch and whip finish right on the bobbin barrel (It works best on middle sizes.) Top quality surgical stainless steel thread tube Unique O-ring and thread keeper grip Perfect for a broad range of hook sizes and tying styles Features our legendary 'click' tension adjuster Shorty model FEATURES: Approximately 3/4" shorter than the "Rite" Standard Great for tiny flies or smaller hands, but many tiers with large hands swear by this bobbin. Zirconia Ceramic Thread Tube Small Diameter Barrel Removable Vinyl Grip Solid Brass Arm "Click" Drag Adjustment 1-9 ounces of thread tension Works great with spooled wire Mag model FEATURES: Heavy duty! Designed for big fly tying applications. Extra long, 5" fly tying bobbin for leverage and big hooks Large diameter thread tube, accommodates threads as large as medium chenille Becoming popular as a rod-winding tool. Accommodates Gudebrod rod thread and Dynacord. Heavy duty click drag system, 2-16 ounces of thread tension Cermag model FEATURES If you are tying larger flies, or especially those that have longer shanks like streamers and saltwater flies, the CerMag offers you the additional length you need. Stainless steel with zirconia ceramic insertSurgical quality stainless steel.Very high pressure click drag systemHeavy duty thread tension, 2-16 ounces thread tensionPerfect for longer hooks such as streamersExcellent for spinning deer hair