Dual Headphone Jack Audio and Charge Cable Adapter for Phone 7/7 Plus/8/8 Plus/X Support Calling + Sync + Music Control + Charger UNIQUE SCRATCH FREE DESIGN - Never worry about your wheels scratching your floor again. PVC Design allows for smooth roll without damage to floor. 3" DIAMETER allows you to transition from any floor to another. Tile to Carpet, Hardwood to Tile, Carpet to Cement, Vinyl to Rug. The size allows transitions to be easy while in or out of the chair. UNIVERSAL SIZE allows these casters to be used on almost any chair. Don't settle for the cheap set that comes on your expensive chair upgrade to high quality wheels that will last forever! NOT COMPATIBLE WITH IKEA CHAIRS. DURABILITY + SAFETY + CONVENIENCE = 1 PERFECT PRODUCT! These PenTrean Casters will relieve the stress of rolling on your office chair. Never get frustrated again. Let smooth gliding be the new normal! ORDER NOW AND SAVE BIG!! You can purchase with PEACE OF MIND, backed by our satisfaction guarantee! If you are ever unsatisfied with your purchase we will refund your money no questions asked!