Brass ball indicators in bright Saturn yellow tube assembly provide higher visibility than traditional bubble levels. Engraved and hand painted numbers make for a functional, easy-to-read display. Slope indicator tube assembly is made out of a rugged copolymer “flex tube” for ultimate durability. The levels includes a piece of 3M VHB (Very-High Bond) adhesive tape on the back for easy stick-on mounting. Also includes two guide holes for screw mounting. Pair with leveling blocks for a full camping trailer leveling system. From durable, high-quality materials. Lev-o-gage slope indicators are built to last.