Our micro-insert products are available in conical bottom, flat bottom, conical bottom with polyspring. Thermo Fisher Scientific™ Sample Handling OEM Catalog (LPP, La 05091674, 0.2ml Micro-Insert, 31 x 5mm, clear glass, 1st hydrolytic class, flat bottom VE = 1000 Stk. 05130426, Spring for 05 09 0279, 36 x 5mm VE = 1000