16mm inner test tube cap, white color, LDPE made; assort to 16mm test tube; 16,000pcs MOQ AMA 16mm test tube cap: White color, LDPE made, assorted to 13mm diameter test tube100pcs /bag & 8,000pcs /ctn16,000pcs MOQ, 5-15 days delivery time AMA is quality & price combinedA wide range of tube size are available for choose~!