Refined Feline Refined Litter Box Internal plastic litter liner with high walls. Contains litter for easier clean up Large fits most Large and Jumbo size plastic litter trays,xLarge fits electric litter boxes including LitterMaid Elite, LitterMaid Elite Mega, ScoopFree, and Petmate Purrforma.Measures:Large:External: 27.5w x 28h x 20d inches,Internal: 25w x 20h x 17d inches,Large:External: 33.5w x 28.5h x 23d inches,Internal: 31.5 w x 20.5 h x 20 d inches.Top storage drawer Reversible walls for left or right entry External litter catch tray sold separately