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72" x 72" Manual /wall Projection Screen is ideal for indoor and outdoor presentations, this proven and reliable tripod portable projection screen combines precision with the elegance of a traditional design. Its rugged construction will withstand the rigors of daily usage while its adjustable locking ring provides ease in its adjustable height settings. Ideal for  as portable screen.It's product will never regrets buying.72 x 72 Manual screen is a type of projector screen that is been operated manually.It is mounted on the wall or ceiling. It is a pull down type of screen. Pulling manually controlled Square Shape Fabric is matte white screen Durable casing Good for home theater,board room meeting, Schools, office, Hotels, Bars and Restaurants .

When you stop stepping on the pedals, neither the chain nor the jacket rotates, but the rear wheel still drives the core and the jack to rotate forward under the action of inertia. At this time, the inner teeth of the flywheel slide relative to each other, thereby compressing the core. In the slot of the child, Qianjin compresses the spring again. When the top of the jack tooth slides to the top of the inner tooth of the flywheel, the jack spring is compressed the most and then slides a little forward, and the jack spring is bounced to the tooth root, making a "click" sound. The core rotates faster, and the jins quickly slide on the inner teeth of each flywheel, making a "click" sound. When the pedal is stepped in the opposite direction, the jacket rotates in the opposite direction, which will accelerate the sliding of the jins and make the "click" sound more rapid. Multi-stage flywheel is an important component in bicycle transmission.Bicycle accessories are a general term for all parts and accessories of the bicycle body. According to the large structural frame of the body, it can be divided into several categories: frame, tire, pedal parts, front fork assembly, chain, flywheel and so on. Among the 25 accessories such as the frame, tires, pedals, brakes, chains, etc. of the bicycle, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, and it bears the most weight of people and goods. According to the working characteristics of each accessory, it can be roughly divided into guiding system, driving system and braking system. Bicycle bell, bicycle chassis, bicycle brake, bicycle chain lock, bicycle full chain box, bicycle chain, bicycle sprocket crank, bicycle generator, bicycle power meter, bicycle brake, bicycle external derailleur, bicycle rack, bicycle flywheel , Bicycle Fork Lock, Bicycle Front Fork, Bicycle Gloves, Bicycle Handbrake, Bicycle Handlebar, Bicycle Grip, Bicycle Wheel Brake, Bicycle Light, Bicycle Lock, Bicycle Rack, Bicycle Pliers, Bicycle Fender, Plastic Wheel Bicycle , Bicycle parts production line, Bicycle pedal, Bicycle pump, Bicycle steel ring, Bicycle saddle, Bicycle safety fork, Bicycle spare parts, Bicycle spoke, Bicycle bracket, Bicycle steel ball, Bicycle tire pump, Bicycle inner tube, Bicycle inner and outer tube, Bicycle Tyre, Bicycle wind speed increaser, Bicycle wrench, Stem (stem), Grip cover/strap, Headset, Brake guide, Basket, Mirror, Wheel, Saddle, Brake cable, Down tube, Water bottle, locks, chainrings, cranksets, braces, chains, chainstays, seatstays, mud removers, racks, handlebars, brake grips, head tubes, forks, valves, spokes, seatposts, top tubes , seat tube, pump, pedal, transmission, flywheel, tire, car explanation.