Got a Wltoys V911S, XK K110, or K110S RC helicopter that needs some TLC? This 2-piece gear set is exactly what you need to get back in the air! These black plastic gears are super lightweight (about 4g each) and designed as direct replacements for worn or damaged original parts. Installation is straightforward - just swap out the old gears and you're good to go. They're compact and don't take up much space in your repair kit, which is perfect for when you're out flying and need a quick fix. Whether you're dealing with stripped teeth or just want some backup parts on hand, these gears provide that higher strength you need for smoother helicopter operation. They help make your remote control helicopter look more realistic and perform better too. It's always smart to have spare parts around when you're into RC hobbies, and this gear set covers some of the most popular helicopter models out there. No complicated installation required - just simple, effective replacement parts that keep your helicopter flying great!