About these items:Ergonomic Saddle Design: The saddle-shaped seat design helps align the body for better posture by relieving pressure on the waist and legs, preventing back pain and spinal tilt during long hours of sitting.Thickened Cushion: The seat cushion is made from high-density foam with a 20% thicker surface for added comfort, offering a breathable, durable, and easy-to-clean leather surface that resists deformation and fading.Adjustable Height: The height of the stool is adjustable from 21.7" to 28.0" (55-71 cm) to cater to different seating needs and ergonomic preferences in settings such as salons, laboratories, dental clinics, and workshops.450 lbs Weight Capacity: The stool features a strong metal base with a 21.3" diameter (54.9 cm) that supports up to 450 lbs, ensuring long-lasting durability and stability for a wide range of users.Silent PU Wheels: The stool is equipped with five smooth 360° rotating PU wheels that glide quietly across various surfaces, including carpet, tiles, and hardwood, without leaving marks.Key Differences:Seat Style:Saddle Stool (MST003 Series) provides ergonomic saddle seating that encourages proper posture and relieves pressure on the legs.Round Stool (MST001 and MST002 Series) features a round design that offers comfort and support with a slightly larger backrest in certain models.Backrest:Some models, like MST001-F and MST003-4, feature a backrest for added support.Height Range:MST003-4 (Saddle Stool with Backrest) and MST002 (Round Stool with Backrest) have a taller adjustable height range of 33.1"-39.4" (84-100 cm), providing more flexibility in seating height.Other models, such as MST003-3W, MST001-B, and MST001-W, have an adjustable height of 21.7"-28.0" (55-71 cm).Footrest:The MST001-F (Round Stool with Footrest) comes with an added footrest for improved comfort during use.Color:Multiple color options are available, such as Black and White, to suit different work environments.Specifications:Item Model Number:MST003-3W, MST003-3B, MST001-B, MST001-F, MST002, MST003-4, MST001-WColor:White (MST003-3W, MST001-W), Black (MST003-3B, MST001-B, MST001-F, MST003-4), with some models offering backrest and footrest.Style:Saddle Stool (MST003 series), Round Stool (MST001 series), Round Stool with Backrest (MST002, MST003-4).Main Materials:PU Leather, Sponge, IronWeight Capacity:450 lbs (204 kg)Adjustable Height:21.7"-28.0" (55-71 cm) for most models, and 33.1"-39.4" (84-100 cm) for backrest models.Product Size:21.3" x 21.3" x (21.7-28.0)" / 54 x 54 x (55-71) cm for most stools, and 21.3" x 21.3" x (33.1-39.4)" / 54 x 54 x (84-100) cm for backrest stools.Seat Size:14.8" x 14.1" / 37.5 x 36 cm for saddle stools, and Ï15.7" x 3.9" / Ï39.9 x 9.9 cm for round stools.Net Weight:10.4 lbs / 4.7 kg for standard stools, and up to 15.8 lbs / 7.15 kg for stools with backrests or footrests.Package Content:1 x Saddle or Round Stool5 x PU Casters1 x Electroplated 5-Star Base1 x Gas Lift1 x Saddle or Round Stool SeatOptional:1 x Backrest (MST002, MST003-4)1 x Footrest (MST001-F)