Longitudinal section of European white elm burl (Ulmus laevis), Europe Wood sample, sanded and without any further surface treatment: 8 x 12 cm; wood origin: Europe; average wood density: 565 kg/ml at 12% moisture; Janka hardness test: 367 kgf, 810 lbf, 3620 N; IUCN Red List = DD (2017)