Specifications: 2 sided waterproof chalkboard and whiteboard that can be used on both sides; Telescopic rod: Telescopic length approx. 7.5 - maximum approx. 39.4 inches (19 - 100 cm); Board material: acrylic + double-sided steel plate (compatible with double-sided magnet); Board size: H 5.7 x W 6.9 inches (145 x 175 x 2 mm); Frame width: 0 mm); Frame width: approx. 0 mm); Compatible with tepra size; Recommended writing instruments; Grip: Silicone resin (13 mm). Holes) [Usage] Dry erase markers and chalk are vulnerable to water, and when sudden rain or snow falls, it may bleed or flow, and it seems to be used with water resistant chalkboard markers that are difficult to flow even in areas with heavy rain or snow. In particular, in the cold region, Tohoku and Hokkaido has high demand for water resistance chalkboards, and it tends to be preferred. Water-resistant chalkboards are not recommended for writing. Waterproof chalkboards can be used with BM erasable soft chalk. Use a water resistant chalkboard maker to erase your water resistant chalkboards using a wet cloth containing melamine sponge or moisture. (If the dirt is noticeable, please wipe it with a neutral and weak alkaline solution diluted with water. )