A handy set of replacement straws & a cleaning brush – exclusively for the b.box Sippy Cup. To replace the straw, carefully grab the pull tab on the straw & pull down to release. Then, gently remove the weight & attach to the spare straw. Use the specially designed cleaning brush to keep your straw squeaky clean. Simply insert the cleaning brush from the base of straw & push up to clean inside. Gently pull down to remove the brush, repeat for both sides with warm soapy water.