Brand: Keltrion Color: Yellow 12 packs Features: Adjustable Height: Customizable setup options (6+6 or 3+3+3+3) for leveling single, dual, or all wheels. Suitable for all types of campers and RVs. Compatible with trailer jacks, pad jacks, stabilizers, and more Sturdy and Durable: Made from long-lasting performance polymer, ensuring long lifespan and strong weight capacity. Heavy duty and durable structure, offering better quality compared to competitors Portable Design: Comes with a storage bag with carry handles for easy transportation. Bright yellow color enhances visibility to avoid leaving them behind Safety and Stability: 12-piece pack and interlocking leveling blocks - 8.5 inch * 8.5 inch * 1.3 inch. Non-slip feature and solid bottom design prevent sinking on soft ground ensuring a stable base for RVs Ease of Use: Each set of stackable jack blocks is easy to transport and store, making them an essential accessory to your RV camping gear. If you encounter any issues, please feel free to contact customer service model number: DWH-102-Y12new Part Number: 12 Package Dimensions: 17.2 x 9.1 x 7.1 inches