Check the listing for details. Control Line Parts Hardware Adjustable Tip wieght boxes. Color: beige/ black, Condition: New, Made in United States. Listed at 10.00 USD. Adjustable weight boxes are the answer to the question of how to change the amount of weight after the airplane is built. Nearly every airplane has to be trimmed out after construction, and serious builder / flyers know that changing the amount of weight can dramatically affect an airplane's performance. With an adjustable weight box, you can build into the wing half of the weight called for on the plans, then put the other half in the weight box. This will give you a wide range of weight adjustment. The weight box is 3D printed in PETG plastic fully assembled in two [2] different sizes with hardware . Can be glued with any C/A adhesive For .09 to .35 size control line models Weights not included Sizes 1"x1"x1" and1"x1"x3/4"