materials : This car cup holder extender is made of ABS, the three fences of the upper cup holder have been redesigned, which has improved stability and sturdiness.2 in 1 multifunctional design : The double car cup holder can be divided into 2 cup holders by rotating the top one. The top cup holder extension adapter can be extended from 2.87'' to 5.9'', which can hold drinks, coffee, food, snacks, cell phones and iPads , etc. The smaller bottom rack can hold bottles under 20 oz.Adjustable and stable base Using the extendable base, it is easy to install the cup holder in different cars. The base is suitable for ROUND CUP SLOT, insert it into the car cup slot, then rotate the cup holder to expand the diameter of the base until it is firmly installed.Suitable for most cars: This 2 in 1 double cup holder is suitable for most car locations. Since the shape of cup slots in cars vary widely, it may not be compatible with certain styles of sharp angle cup slots. Please check the product size carefully before purchasing.