MATERIAL: Metal construction, solid and durable to use, lightweight for easy carry FITS- all D s with 1 or 4in Socket Square Tension Rods CONTINUOUS MOTION SPEED KEY- a handy speed key, which is terrific when changing d heads PRACTICAL- great for adjusting the tension rods on d s for the desired pitch The regular keys have the right size, weight and feel for tuning d s, plus there's 3 of them, in case you lose one (which you probably will!). It also comes with a handy speed key, which is terrific when changing heads. FUNCTION: essential d accessory will make sure your d skins are always in fine tune colour: Silver Material: Metal Package Contents: 4 x D Keys Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.