The Incredibowl m420 Steamroller is the slightly smaller version of the i420. It is manufactured from identical materials – a tough, heat-resistant polycarbonate tube, borosilicate glass bowl with inbuilt screen and aircraft-grade aluminium.This piece hits hard and fast as is but can also be expanded with the addition of a bubbler or use it as a regular bong bowl. Its capacity is 0.5 gr. at a time and when the spring-loaded carb is released you get the full force of that.The Incredibowl m420 Steamroller can be upgraded with the Trigger Release system.Specifications:Length: 5 in. (12.7 cm.)Indestructible PipeSpring-loaded Carb for quick hitsPolycarbonate BodyMachined Aluminum Bowl Protector Removable Glass BowlThe Incredibowl m420 Steamroller comes with a Limited Lifetime Guarantee. The o-rings, glass components, silicone mouthpieces are excluded. Like brake pads on a car, they are designed to wear out and be replaced .