STRONG AND DURABLE PROTECTION: Our crank defender protection is designed to last! Our crank cover has extra protection to protect your mountain bike by not absorbing water, mud or dirt! HIGH QUALITY MATERIALS: This crank boot brings an elegant solution to protect your cranks and add some style. This top quality kit includes 2 crank defenders to cover the pertinent area of your bike! CUSTOMIZE YOUR BIKE: Don't ruin the look of your bike, improve it! Whether you ride a steel, aluminum or carbon frame protect your cool rig in All Mountain Style. We have different colors available to improve the look of your bicycle! EASY TO INSTALL: Simply lubricate crank arm with oil, then soften the crank arm part with the help of a hairdryer or heat gun. After this lubricate the interior with oil and slide them on. Adjust the protector to your preference and ride in style! TIGHT FIT BIKE CRANKS: This crank arm sleeve will fit most carbon and some aluminum cranks. These crank booties squeeze a tight fit to avoid debris between defender and crank arm!