Air filters for Chinese mini bikes including the Coleman BT200X, CC100X, CT100U, CT200U, CT200U-EX, RB100, RB200, DCC100X, DCT100U, B100, B200 B200RS, B200RSV, B200R, B200C and B200V. Also Massimo, Monster Moto mini bike, Lowes Axis and Baja MB165 and MB200. Dirty air filters = poor running engines. Change frequently.