ITEM NAME:3 Piano Caster Cups Gripper Set with Sturdy 250kg Load Bearing ABS for Gran G5H7 3 Piano Caster Cups Gripper Set with Sturdy 250kg Load Bearing ABS for Gran G5H7 Color:black;Material:ABS;Quantity: 3 Inside(concave part) diameter: 6cm / 2.4in Outside diameter: 10cm / 3.9in Product weight: 34g / 1.2oz Made of high-quality ABS, 3 cups in 1 package. Excellent load bearing capacity, support piano of about 250kg. Protect wheel of piano from rusting. Protect floor from scratch causing by piano. Package List:3 x Cup Note:Light shooting 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.