The RAM Mount for the Magellan Maestro is compatible with 4200, 4210, 4220, 4250 GPS Units and is available at Adventure Designs. The Maestro is made of sturdy, marine grade aluminum with a black powder coating and a 1-inch rubber ball. MATERIAL: Powder Coated Marine Grade Aluminum BALL SIZE: 1 Inch Rubber Ball COLOR: Black Powder Coat Made in the USA Lifetime Warranty |