The Madbull PenPal is a silicon oil solution that is designed to be used when you are on the go. Silicone oil is essential for your airsoft equipments and now Madbull have made one in handy style. The slim design in pen shape format allows you to carry or store it in several areas including molle weave, admin pouch, or pocket. In all storing it will never become an issue. The cap and body are made from durable plastic to prevent damage or leaking, so no messy around.