medium grain graphite block

Peb yog cov kws tshaj lij Tuam Tshoj nruab nrab grain graphite thaiv cov chaw tsim khoom thiab cov chaw muag khoom, tshwj xeeb hauv kev muab cov kev pabcuam zoo tshaj plaws. Peb sov siab txais tos koj mus yuav cov khoom zoo nruab nrab graphite thaiv los ntawm peb lub hoobkas.