Perfect for a cup of coffee or for bringing along your favorite tunes. Cage height and diameter are adjustable to fit large sized tumblers or speakers. MATERIAL:- Engineering grade polymer / Rubber OUTER DIAMETER:- Upper - Fits ;75 - ;90 mm / ;2.9" - ;3.5" Lower - Fits ;60 - ;78 mm / ;2.4" - 3.1" ADJUSTABLE LENGTH:- Fits height 175 - 240 mm / 6.9" - 9.4" SIZE:- 19.4-21 x 9.4 x 9 cm / 7.6"-8.3" x 3.7" x 3.5" WEIGHT:- 120 g / 4.22 oz